Frostcliff Siege is a rare Enchantment card from Tarkir: Dragonstorm Promos (PTDM), collector number 187p. Current market price: $1.79 (foil $2.47), TCGplayer market prices via Scryfall.
As this enchantment enters, choose Jeskai or Temur. • Jeskai — Whenever one or more creatures you control deal combat damage to a player, draw a card. • Temur — Creatures you control get +1/+0 and have trample and haste.