I've seen 6+ units die.
Attack: 3 | Health: 6 | Cost: 5
The first time I attack this game, summon another attacking champion from your deck or hand.
Attack: 4 | Health: 7 | Cost: 5
Deal 3 to each enemy that was summoned this round.
Create a Thresh in your deck.
Attack: 0 | Health: 0 | Cost: 4