交(こう)戦(せん)地(ち)帯(たい)の複(ふく)製(せい)機(き)

Prototype — 3/3

When this creature enters, return target creature an opponent controls with power less than this creature's power to its owner's hand. If that creature wasn't a token, conjure a duplicate of it into your hand. It perpetually gains "You may spend mana as though it were mana of any color to cast this spell."