Cheapest priced copy (Modern Horizons 3 Commander): $12.99 at Card Kingdom, near mint, their price list as of .
Eldrazi Monument 
Artifact · Mythic · Commander 2015 · #253
Creatures you control get +1/+1 and have flying and indestructible.
At the beginning of your upkeep, sacrifice a creature. If you can't, sacrifice this artifact.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
6 printings · $12.99 to $49.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2015 | 253 | Mythic | $13.99 | — |
| Commander Anthology | 216 | Mythic | $13.99 | — |
| Modern Horizons 3 Commander | 290 | Mythic | $12.99 | $17.99 |
| The List | CMA-216 | Mythic | $12.99 | — |
| Secret Lair Drop | 603 | Mythic | — | $37.99 |
| Zendikar | 199 | Mythic | $16.99 | $49.99 |
2 rulings from Wizards of the Coast
- 1 October 2009If you control any creatures as the triggered ability resolves, you must sacrifice one. You can’t choose to sacrifice Eldrazi Monument instead. You sacrifice the Monument only if you had no creatures to sacrifice.
- 1 July 2013Lethal damage and effects that say “destroy” won’t cause a creature with indestructible to be put into the graveyard. However, a creature with indestructible can be put into the graveyard for a number of reasons. The most likely reasons are if it’s sacrificed, if it’s legendary and another legendary creature with the same name is controlled by the same player, or if its toughness is 0 or less.