Gift of Growth is a common Instant card from Dominaria (DOM), collector number 163. Current market price: $0.12 (foil $0.18), TCGplayer market prices via Scryfall.
Kicker {2} (You may pay an additional {2} as you cast this spell.) Untap target creature. It gets +2/+2 until end of turn. If this spell was kicked, that creature gets +4/+4 until end of turn instead.