Raiden Shogun, the Eternal

Double Strike, Trample
Whenever Raiden Shogun, the Eternal deals
combat damage to a player, casting and
equipping costs for equipment you control
are reduced by {x} until the end of the turn,
where {x} is the total damage dealt by
Raiden Shogun, the Eternal this turn.
Partner with Baal, Electro Archon