Cheapest priced copy (Commander Masters): $4.99 at Card Kingdom, near mint, their price list as of .
Calamity of the Titans 
Sorcery · Rare · Commander Masters · #745
As an additional cost to cast this spell, reveal a colorless creature card from your hand.
Exile each creature and planeswalker with mana value less than the revealed card's mana value.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $4.99 to $9.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Masters | 713 | Rare | $5.49 | — |
| Commander Masters | 745 | Rare | $4.99 | $9.99 |
2 rulings from Wizards of the Coast
- 28 July 2023The colorless creature card you reveal doesn't have to still be in your hand as Calamity of the Titans resolves. If it's not, use its mana value as it last existed in your hand.
- 28 July 2023The colorless creature card stays revealed until Calamity of the Titans leaves the stack.