Ajani's Presence is a common Instant card from Journey into Nyx (JOU), collector number 2. Current market price: $0.20 (foil $0.49), TCGplayer market prices via Scryfall.
Strive — This spell costs {2}{W} more to cast for each target beyond the first. Any number of target creatures each get +1/+1 and gain indestructible until end of turn. (Damage and effects that say "destroy" don't destroy them.)