Cheapest priced copy (Modern Horizons 3 Commander): $4.99 at Card Kingdom, near mint, their price list as of .
Ulamog's Dreadsire 
Creature — Eldrazi · 10/10 · Rare · Modern Horizons 3 Commander · #38
Vigilance
Ward—Sacrifice a permanent with mana value 1 or greater.
{T}: Create a 10/10 colorless Eldrazi creature token.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $4.99 to $11.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Horizons 3 Commander | 38 | Rare | $4.99 | $11.99 |
3 rulings from Wizards of the Coast
- 7 June 2024If a permanent on the battlefield has {X} in its mana cost, X is 0 when determining its mana value.
- 7 June 2024The mana value of a face-down permanent is 0.
- 7 June 2024The mana value of a token that isn't a copy of another object is 0.