Cruel Feeding is a common Instant card from Journey into Nyx (JOU), collector number 64. Current market price: $0.08 (foil $0.09), TCGplayer market prices via Scryfall.
Strive — This spell costs {2}{B} more to cast for each target beyond the first. Any number of target creatures each get +1/+0 and gain lifelink until end of turn. (Damage dealt by a creature with lifelink also causes its controller to gain that much life.)