Several ways to pull this off. This time it was duplicating lens+faceless. Sometimes it's t7 naga shenanigans with a wisdomball(or jandice hp).
Stats might not look impressive compared to top end demon/eles however,
At the start of turn, they are dealing about 225 damage twice each to the highest minion, so about 2250 damage to the opponent before battle. Wiped out the 3rd place's beasts before combat began.
When they attack, they are giving the board 80+ attack per rally. The board ended up with 1k+ attack.
Reborn with full stats including the buffed attack.
Had no issue beating opponent board with 5 2k/2k minions. Would probably struggle with 2.5k+ board
They also give 1 magnetic mech end of turn. 10 total with Drakkari(swapped out for a shield minion last fight. Had 30+ gold/turn