Defender

Metalcraft – At the beginning of your upkeep, if you control three or more artifacts, exile the top card of your library. You may play that card this turn. Until end of turn, Yunobo, Champion's Descendant gains indestructible and can attack this turn as though it didn't have defender.

Whenever you cast a creature spell from exile, copy it. The copy gains haste. Sacrifice it at the beginning of the next end step.