Curious Klefki

Prankster — Whenever Curious Klefki attacks, it
gains first strike until end of turn as long as you
didn't cast a spell this turn.
Whenever Curious Klefki deals combat damage
to a player, create a Key token (Its an artifact with
"{t}, Sacrifice this artifact: Untap target noncreature
artifact you control.")
Klefki loves to collect keys and will confront opponents
with a fierce jingle of their collection.