Doom Womb Witch

Whenever an opponent casts a creature spell, put
a doom counter on Doom Womb Witch for each color of mana spent to cast it.
At the beginning of your upkeep, create a
number of 1/1 black Enormity creature tokens equal to the number of doom counters on Doom Womb Witch. Remove all doom counters from Doom Womb Witch.
Eewwwww...