Gamora, Daughter of Thanos

Whenever you sacrifice a black creature, you
may pay 2 life. If you do, each other player sacrifices a creature.
Whenever you sacrifice a green creature, you
may gain 2 life.
" I go by many names, my Tick-Ridden Troll, but
I'm sure the one that Black Knight knew me by is
Gamora, the Deadliest Woman in the whole
Galaxy!"