Call for Unity is a rare Enchantment card from Aether Revolt Promos (PAER), collector number 9s. Current market price: — (foil $0.95), TCGplayer market prices via Scryfall.
Revolt — At the beginning of your end step, if a permanent left the battlefield under your control this turn, put a unity counter on this enchantment. Creatures you control get +1/+1 for each unity counter on this enchantment.