Monastery Siege is a rare Enchantment card from Fate Reforged (FRF), collector number 43. Current market price: $1.03, TCGplayer market prices via Scryfall.
As this enchantment enters, choose Khans or Dragons. • Khans — At the beginning of your draw step, draw an additional card, then discard a card. • Dragons — Spells your opponents cast that target you or a permanent you control cost {2} more to cast.