i got this idea from readign the mightly wings thread.
Card: Steroids
Type: Spell
Cost: 3 Entrophy
Effect: Target creature's attack doubles for one turn, and the creature gains one infection counter.
Upgraded version:
Card: Prescription Steroids
Type: Spell
Cost: 5 Entrophy
Effect: Target creature's attack doubles permanently, and the creature gains five infection counters.
They don't really fit the flavor of the game, but you could use some funny pictures with them!