Rimeaxe Seidrweaver

Vigilance, prowess
{s}{w}{u}, Unattach an Equipment you control
from Rimeaxe Seidrweaver: Search your library
for a blue or white instant card with converted
mana cost X or less, where X is the amount of
snow mana spent to activate this ability. Cast
that card without paying its mana cost. Then
shuffle your library.
Footfalls of thunder.