Mountainscale Wurm

Spend only Black and/or red mana on X.
Trample, indestructible
Reforge — As this enters, you may choose an
artifact or enchantment from an opponent's
graveyard. Put it into its owner's library X from
the top, and this creature gains its abilities.
This creature's power and toughness are
each equal to X plus the mana value of the
card it Reforged.