Counterspell (Ice Age/Alliances, Tempest/Stronghold/Exodus, Masques/Nemesis/Prophecy) Counterspells are decent in limited, but by no means the be-all, end-all of the universe
Pack Contents: 15 cards
On top of this already intimidating list of mechanics, whenever Captain America attacks, other Heroes you control gain +X/+X until the end of the turn, where X is the value of Captain America's toughness
It needs less bodies to win with since you only need to deal 10 total damage to your opponent to kill them, and in multiplayer you just need 10 per person, very possible in one turn
Dealing one damage on play, this can weaken characters, shut down abilities that rely on a clean bill of health, and wipe out anything that is already on the verge of being banished