The Gate

The Gate enters the battlefield tapped.
If you control a creature with power 3 or greater,
put a +1/+1 counter on it.
If your opponent controls a human with
toughness 3 or less, put a -1/-1 counter on it.
{6}{t} Sacrifice The Gate. Destroy all creatures
that are Nightmares, Horrors, Zombies,
Demodogs, and Demons. You gain 3 life for each creature destroyed this way.