Æsahættr, the Subtle Knife

Equip {1}
{t}: Target opponent's creature's attack and
toughness is cut in half, rounded up. Then,
opponent creates a token of that target creature.
{t}: During your turn, draw cards from target
opponent's library. You may spend mana as
though they were mana of any color to cast these
spells.
This knife could cut not just flesh but spirit. It could
slice through Worlds.