Cheapest priced copy (The List): $5.49 at Card Kingdom, near mint, their price list as of .
Demon of Death's Gate 
Creature — Demon · 9/9 · Mythic · Magic 2011 · #92
You may pay 6 life and sacrifice three black creatures rather than pay this spell's mana cost.
Flying, trample
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $5.49 to $16.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Magic 2011 | 92 | Mythic | $6.49 | $16.99 |
| The List | M11-92 | Mythic | $5.49 | — |
3 rulings from Wizards of the Coast
- 15 August 2010Casting Demon of Death's Gate by paying its alternative cost doesn't change its mana cost or mana value.
- 15 August 2010Casting Demon of Death's Gate by paying its alternative cost doesn't change when you can cast it. You can cast it only at the normal time you could cast a creature spell.
- 15 August 2010Effects that increase or reduce the cost to cast Demon of Death's Gate will apply to it even if you choose to pay its alternative cost.