Cheapest priced copy (Tarkir: Dragonstorm Commander): $15.99 at Card Kingdom, near mint, their price list as of .
Colossal Grave-Reaver 
Creature — Dragon · 7/6 · Rare · Tarkir: Dragonstorm Commander · #50
Flying
Whenever this creature enters or attacks, mill three cards.
Whenever one or more creature cards are put into your graveyard from your library, put one of them onto the battlefield.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $15.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Tarkir: Dragonstorm Commander | 50 | Rare | $15.99 | — |
| Tarkir: Dragonstorm Commander | 90 | Rare | $15.99 | — |
One ruling from Wizards of the Coast
- 4 April 2025All three of the milled cards are put into your graveyard at the same time. If there is more than one creature card among those cards, the last ability triggers only once.