Cackling Counterpart is a rare Instant card from Modern Masters 2017 (MM3), collector number 32. Current market price: $0.30 (foil $0.68), TCGplayer market prices via Scryfall.
Create a token that's a copy of target creature you control. Flashback {5}{U}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)