Cheapest priced copy (The List): $5.49 at Card Kingdom, near mint, their price list as of .
Fist of Suns 
Artifact · Rare · Fifth Dawn · #123
You may pay {W}{U}{B}{R}{G} rather than pay the mana cost for spells you cast.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
4 printings · $5.49 to $24.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Fifth Dawn | 123 | Rare | $5.99 | $24.99 |
| Commander 2017 | 211 | Rare | $5.99 | — |
| The Lost Caverns of Ixalan Commander | 113 | Rare | $11.99 | $22.99 |
| The List | C17-211 | Rare | $5.49 | — |
4 rulings from Wizards of the Coast
- 1 December 2004If you apply Fist of Suns's alternative cost to a spell with {X} in its mana cost, X is 0.
- 1 December 2004Fist 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.
- 1 December 2004If 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.
- 1 February 2014If you pay {W}{U}{B}{R}{G} rather than pay the mana cost of a spell with {X} in its mana cost, the only legal choice for X is 0.