Saw in Half is a rare Instant card from Bloomburrow Commander (BLC), collector number 113. Current market price: $5.95, TCGplayer market prices via Scryfall.
Destroy target creature. If that creature dies this way, its controller creates two tokens that are copies of that creature, except their power is half that creature's power and their toughness is half that creature's toughness. Round up each time.