Shapeshifter's Marrow

Enchantment, 2UU (4)
At the beginning of each opponent's upkeep, that player reveals the top card of his or her library. If it's a creature card, the player puts the card into his or her graveyard and Shapeshifter's Marrow becomes a copy of that card. (If it does, it loses this ability.)¹
Illus. Chippy

Crystal Keep Rulings Summaries

• When it becomes a copy of the creature, it loses all current abilities, types, and text and becomes whatever it is copying. [Future Sight FAQ 2007/05/01]
• Note - Also see Copying Objects, Rule 503.

Format Legality	Legal in Vintage, Legacy, Extended Banned in Standard
Printings (1/9)	Future Sight (Rare)