Dauntless Unity is a common Instant card from Zendikar Rising (ZNR), collector number 9. Current market price: $0.11 (foil $0.11), TCGplayer market prices via Scryfall.
Kicker {1}{W} (You may pay an additional {1}{W} as you cast this spell.) Creatures you control get +1/+1 until end of turn. If this spell was kicked, those creatures get +2/+1 until end of turn instead.