Eggsabone

Treefolk you control get +1/+1.
Horrors you control get +1/+1.
When Eggsabone enters the battlefield,
create two 1/2 treefolk horror creatures
tokens with "When Eggsabone leaves the battlefield, sacrifice this creature."
Eggsabone has become something of a story to frighten
kids away from the woods, be a damn shame if their
parents found out it's real.