Conclave Phalanx is a common Creature — Human Soldier card from Modern Masters 2015 (MM2), collector number 12. Current market price: $0.07 (foil $0.28), 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.