Eris Morn, Crota's Bane

Deathtouch
Whenever a creature you control dies, create a Guardian Soul Stone token with "{t}, Sacrifice:
Give a creature you control +1/+1 until end of
turn."
Guardian Soul Stones can be sacrificed and used
as {1} to pay for Eris Morn, Crota's Banecasting
cost.
Fireteam