Xzav Slaughterboss

Whenever Xzav Slaughterboss deals combat damage
to a player, create a Treasure token and exile the
top card of that player’s library. Until end of turn,
you may cast that card.

Dash {1}{r} (You may cast this spell for its dash
cost. If you do, it gains haste, and it’s returned
from the battlefield to its owner’s hand at the beginning of the next end step.)