Sidisi, Beyond Death

Exploit (When this creature enters the battlefield, you
may sacrifice a creature.)
Whenever a creature becomes exploited, you
may pay {2}{b}{g}. If you do, draw a card and that creature isn't sacrificed. the exploit effect still
counts as though the creature was sacrificed.
When Sidisi, Beyond Death exploits a creature,
put a +1/+1 counter on Sidisi for each creature
card in graveyards.