Minion Reflector is a rare Artifact card from Shards of Alara (ALA), collector number 211. Current market price: $1.67 (foil $4.93), TCGplayer market prices via Scryfall.
Whenever a nontoken creature you control enters, you may pay {2}. If you do, create a token that's a copy of that creature, except it has haste and "At the beginning of the end step, sacrifice this permanent."