The king and I

When this creature enters, you may exile an instant card from your hand. , : Copy the exiled card. You may cast the copy without paying its mana cost. X is the mana value of the exiled card.

Up to two target creatures each get +0/+3 until end of turn. Untap those creatures. At this turn's next end of combat, tap each creature that was blocked by one of those creatures this turn and it doesn't untap during its controller's next untap step.

Until end of turn, target creature gains ": Return target nonland permanent to its owner's hand."

Inspired — Whenever King Macar becomes untapped, you may exile target creature. If you do, create a Gold token. (It's an artifact with "Sacrifice this token: Add one mana of any color.")