Pontiff Sulyvahn

Boreal creatures cost {1} less to cast.

When Pontiff Sulyvahn enters the battlefield, put a Boreal counter on target creature you don’t control. Then exile the top card of your library.

Whenever a creature with a Boreal counter on it dies, you may cast target card exiled by Pontiff Sulyvahn, without paying its mana cost.

Whenever Pontiff Sulyvahn attacks, create a 1/1 white
Shade creature token with haste and attacking.
Sacrifice this token at the end of combat.