Id Seeker

Flying
Whenever a nontoken creature enters the battlefield, you may put a +1/+1 counter on it. Creatures with at least one +1/+1 counter on
them must attack each turn if able.
"When the stars were right, They could plunge from world to world through the sky; but when the stars were wrong, They could not be."
- H.P. Lovecraft, The Call of Cthulhu