Primal Boost is a uncommon Instant card from Onslaught (ONS), collector number 277. Current market price: $0.10 (foil $0.59), TCGplayer market prices via Scryfall.
Target creature gets +4/+4 until end of turn. Cycling {2}{G} ({2}{G}, Discard this card: Draw a card.) When you cycle this card, you may have target creature get +1/+1 until end of turn.