Tinker Knight the Devious

Defender
At the beginning of your upkeep you may pay {x} if you do, create an x/x colorless construct artifact creature token. Whenever an artifact creature you control dies choose one:
•Return target permanent from a graveyard to your hand with converted mana cost x, where x is the power of the creature that died.
•Cast target spell with converted mana cost x from your hand without paying its mana cost, where x is the power of the creature that died.
When tinker knight dies, return it to th