Lorwyn, Home of Elves

All Elves gain +1/+1, deathtouch and forestwalk.
When Lorwyn, Home of Elves leaves the battlefield, destroy all Elves.
Whenever a Elf comes into play, choose one—
•Destroy target artifact or enchantment.
•Destroy target non-Elf creature with mana cost
equal to the power of the Elf, who has entered
the battlefield.
{t}: Add {b} or {g}.