Make your deck cease to exist on turn one
Player A has a standard deck of 60 cards to which the 4-card rule applies. Player B has a suspicious deck of 81 cards to which the 4-card rule applies. Player A's deck is the deck that will cease to exist. This game must be played in Player B's parents' closet. Player B should get a weighted coin as he will need to control 2,224 coin flips.
Steps
- Begin a game G1 for ante with players A and B. Make sure Player A mulligans to zero cards in hand, so all 59 cards he owns in the game are in his library (both players have one in the ante zone). Player B goes first.
- Player B opening hand: two [[Black Lotus]] into [[Krark, the Thumbless]], [[Harmonic Prodigy]], and [[Pyretic Ritual]] to make 993 red mana.^(1) [[Chromatic Orrery]] for fixing, [[Stroke of Genius]] to draw out library (Krark applies).
- Player B draws [[Rebirth]], [[Darkpact]], [[Split Screen]], two exclusive celebration copies of [[Fraternal Exaltation]], [[Leashling]], [[Shahrazad]], 2 more Black Lotus, and all 64 other random cards in his deck.
- Player B plays Split Screen, making his library of zero cards into four libraries (L1, L2, L3, L4) of zero cards.
- Using the Krark/Harmonic spell replication system, B casts Rebirth 59 times. Each time it resolves player A chooses to ante an additional card, and player B chooses not to.
- Player B repeats the following steps 60 times: a. play Leashling; b. play Darkpact (Krark applies);^(1) c. while Darkpact is on stack activate Leashling's ability to put one random card from hand onto library L1. This means Darkpact will swap a new random card for a new card of Player A's from the ante zone all 60 times, taking A's entire original deck and putting it into library L1.
- Player B plays Leashling and activates its ability, holding priority to activate 6 more times and put 4 random cards plus two Black Lotus and Mr. Garfield's copy of Fraternal Exaltation onto library L2.
- Player B plays Mrs. Garfield's copy of Fraternal Exaltation from his hand to add his newborn brother Player C to the game with a new deck. Because the game does not restart and rules 103.2 and 103.3 have no chance to be applied (103.4 is worded such that it would apply),^(2) player B is the owner of each card in C's deck by bringing them into the game.^(3) Krark applies.
- Player B plays Shahrazad, beginning subgame G2 with players A, B, and C. One Krark flip must be won. Player A takes 0 cards, Player B chooses to take the 7-card library L2, and Player C takes the deck given to him by Player B.^(4) One Krark flip must be won.
- Player A loses subgame G2 as a state-based action, unable to draw a hand. Player B mulligans to zero, leaving all seven cards in his deck. Player C goes first and plays two Black Lotus into Garfield Jr.'s copy of Fraternal Exaltation, adding their newborn brother player D to subgame G2 with a random deck.
- Player C plays Black Lotus into Shahrazad, beginning subgame G3 with players B, C, and D.
- Player A is adopted into the family by the parents.
- Player B mulligans once, and goes first. As this is a multiplayer game, he draws the one card. Player B plays two Black Lotus into Mr. Garfield's copy of Fraternal Exaltation to add player A to subgame G3 with the deck of cards left in game G1 in the form of Split Screen library L1. He can do this because: player A and the library L1 are outside of the game,^(5) player B owns the library L1 in the context of G3 and G1 because it is involved in a game of Magic,^(6) those cards constitute a deck (player A was able to use this deck to begin the game), it is in the parents' closet thus making it a legal target (that is where the game is being played), and player A is now in fact a new brother and thus can join the game.
- Player D plays Black Lotus into Shahrazad, beginning subgame G4 with players A, B, C, and D. Player A now owns the library given to him by player B in G3, as the game started.
- Player B concedes subgame G2, leaving players C and D to continue that subgame but not removing cards from G4 as he does not own them. Players A, C, and D then concede subgame G4 (player B lost as a state-based action trying to draw a hand). Here's what this does: in the main game, each player takes all cards they own in the subgame and shuffles them into their main-game library.^(7) Relative to G4, the main game is subgame G3 with players A, B, C, and D.^(8) A has a library still owned by player B in this subgame as the ownership has not changed for G3.
- Players A, C, and D concede subgame G3 (player B is out of this game, having conceded G2). Relative to G3, the main game is subgame G2 (with only players C and D, as A and B both lost). It is impossible for player B to put any cards in his library, as he conceded.^(9) Rule 101.3 stops him from doing this.^(10) Then, all objects in the subgame cease to exist. Player A's deck, which is owned by player B but is still the same set of cards player A owned at the beginning of the game, is left behind and ceases to exist.
Footnotes (comprehensive rules from this edition)
^(1)Two Krark triggers for every instant or sorcery spell. Make sure to choose the one for which the player will win the flip to apply first, so that the spell is copied before the losing flip returns the original spell to its owner's hand. To make this loop work you must get one winning and one losing flip every time.
^(2)Rule 103.4. Each player begins the game with a starting life total of 20. [note: of all the rules under 103, this is the only one with no indication of a restriction to only the start of the game. I assume that the deck will be treated as a library to make the card function as intended]
^(3)Rule 108.3. The owner of a card in the game is the player who started the game with it in their deck. If a card is brought into the game from outside the game rather than starting in a player’s deck, its owner is the player who brought it into the game.
^(4)Rule 728.2. As the subgame starts, an entirely new set of game zones is created. Each player takes all the cards in their main-game library, moves them to their subgame library, and shuffles them.
^(5)Rule 728.4. All objects in the main game and all cards outside the main game are considered outside the subgame (except those specifically brought into the subgame). All players not currently in the subgame are considered outside the subgame.
^(6)Rule 108.3b. Some spells and abilities allow a player to take cards they own from outside the game and bring them into the game. If a card outside that game is involved in a Magic game, its owner is determined as described in rule 108.3. If a card outside that game is in the sideboard of a Magic game (see rule 100.4), its owner is considered to be the player who started the game with it in their sideboard. In all other cases, the owner of a card outside the game is its legal owner.
^(7)Rule 728.5. At the end of a subgame, each player takes all traditional cards they own that are in the subgame other than those in the subgame command zone, puts them into their main-game library, then shuffles them. This includes cards in the subgame’s exile zone and cards that represent phased-out permanents as the subgame ends. Except as specified in rules 728.5a–c, all other objects in the subgame cease to exist, as do the zones created for the subgame.
^(8)Rule 728.6. A subgame can be created within a subgame. The existing subgame becomes the main game in relation to the new subgame.
^(9)Rule 800.4d. If an object that would be owned by a player who has left the game would be created in any zone, it isn’t created. If a triggered ability that would be controlled by a player who has left the game would be put onto the stack, it isn’t put on the stack.
^(10)Rule 101.3. Any part of an instruction that’s impossible to perform is ignored.