Horde of Notions is a rare Legendary Creature — Elemental card from Modern Masters 2015 (MM2), collector number 178. Current market price: $0.75 (foil $8.82), TCGplayer market prices via Scryfall.
Vigilance, trample, haste {W}{U}{B}{R}{G}: You may play target Elemental card from your graveyard without paying its mana cost.