Venom

{2}{b}: Put a +2/+2 counter on Venom
until the end of the turn.
{2}{b}{b}: Detain target non-land permanent.
If targeted card is a creature, Venom deals damage equal to Venom's power to creature.
{x}{b}: Regenerate Venom. Venom gets {x}+1/+1 counters put on it.
Venom takes double damage from red.