Guile is a rare Creature — Elemental Incarnation card from Duel Decks: Jace vs. Chandra (DD2), collector number 14. Current market price: $0.83, 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.