March of the Multitudes is a mythic Instant card from Guilds of Ravnica (GRN), collector number 188. Current market price: $1.22 (foil $6.66), 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.) Create X 1/1 white Soldier creature tokens with lifelink.