Immugio, Manahunter

When the amount of mana in an opponent's
mana pool becomes greater than three, put a
doom counter on Immugio.
{t}: Destroy target creature. Activate this ability
only if Immugio has a doom counter on it.
Tap an untapped permanent you control:
Draw two cards, then discard a card. Activate
this ability only if Immugio has a doom counter
on it.