Guile is a rare Creature — Elemental Incarnation card from Modern Masters 2015 (MM2), collector number 46. Current market price: $0.82 (foil $3.80), TCGplayer market prices via Scryfall.
This creature can't be blocked except by three or more creatures. If a spell or ability you control would counter a spell, instead exile that spell and you may play that card without paying its mana cost. When Guile is put into a graveyard from anywhere, shuffle it into its owner's library.