Fatal Push is a uncommon Instant card from Aether Revolt (AER), collector number 57. Current market price: $0.82 (foil $4.57), TCGplayer market prices via Scryfall.
Destroy target creature if it has mana value 2 or less. Revolt — Destroy that creature if it has mana value 4 or less instead if a permanent left the battlefield under your control this turn.