Strength of Night is a common Instant card from Apocalypse (APC), collector number 86. Current market price: $0.09 (foil $1.00), TCGplayer market prices via Scryfall.
Kicker {B} (You may pay an additional {B} as you cast this spell.) Creatures you control get +1/+1 until end of turn. If this spell was kicked, Zombie creatures you control get an additional +2/+2 until end of turn.