Fist of Suns
You may pay 
rather than pay the mana cost for spells you cast.
"Willem put it on and started shooting sparks from his hands like some kind of wizard! Was supposed to be my turn next, but the blasted thing won't come off his hand. Send help." —Brazen Coalition expedition dispatch
Illustrated by J.P. Targete
This printing
Prices
If you apply Fist of Suns's alternative cost to a spell with
in its mana cost, X is 0.Fist of Suns's ability is an alternative cost to cast a spell. You can't combine this with other alternative costs, such as flashback. You can pay additional costs, such as kicker, in addition to this alternative cost.
If you cast a spell for which mana of any color can be spent to cast it, you may cast it for Fist of Suns's alternative cost and still spend any color of mana to cover that cost.
If you pay
rather than pay the mana cost of a spell with in its mana cost, the only legal choice for X is 0.
