Upcasting?
Has anyone played with upcasting spells?
Magic missile - cast at tier 3, gives 2d4 darts, DC 13 spell check, use the tier 3-4 mishap table. Tier 5, 3d4 darts, DC 15, uses Tier 5 mishap table.
Compared to lightning bolt tier 3 -3d6 in a line or fireball 4d6 in near.
Tier 5 prismatic orb - 3d8.
Spells like sleep/hold person I'd say upcasting increases the level effected in a similar way (balanced against other spells at that tier that do similar things).