Conclave Phalanx is a uncommon Creature — Human Soldier card from Ravnica: City of Guilds (RAV), collector number 10. Current market price: $0.14 (foil $0.69), TCGplayer market prices via Scryfall.
Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.) When this creature enters, you gain 1 life for each creature you control.