Swell of Courage is a uncommon Instant card from The List (PLST), collector number MOR-26. Current market price: $0.10, TCGplayer market prices via Scryfall.
Creatures you control get +2/+2 until end of turn. Reinforce X—{X}{W}{W} ({X}{W}{W}, Discard this card: Put X +1/+1 counters on target creature.)