Legion Loyalty is a mythic Enchantment card from Tarkir: Dragonstorm Commander (TDC), collector number 122. Current market price: $0.36, TCGplayer market prices via Scryfall.
Creatures you control have myriad. (Whenever a creature with myriad attacks, for each opponent other than defending player, you may create a token copy that's tapped and attacking that player or a planeswalker they control. Exile the tokens at end of combat.)