Cheapest priced copy (Born of the Gods): $7.99 at Card Kingdom, near mint, their price list as of .
Mogis, God of Slaughter 
Legendary Enchantment Creature — God · 7/5 · Mythic · Duskmourn: House of Horror Commander · #89
Indestructible
As long as your devotion to black and red is less than seven, Mogis isn't a creature.
At the beginning of each opponent's upkeep, Mogis deals 2 damage to that player unless they sacrifice a creature of their choice.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $7.99 to $19.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Born of the Gods | 151 | Mythic | $7.99 | $19.99 |
| Duskmourn: House of Horror Commander | 89 | Mythic | $7.99 | — |
| Stardates (Worf, Regent of Terok Nor) | 26 | Mythic | — | — |
| Secret Lair Drop | 78 | Mythic | — | $12.99 |
| Secret Lair Drop | 9994 | Mythic | $10.99 | $12.99 |
14 rulings from Wizards of the Coast
- 15 September 2013Numeric mana symbols ({0}, {1}, and so on) in mana costs of permanents you control don't count toward your devotion to any color.
- 15 September 2013Mana symbols in the text boxes of permanents you control don't count toward your devotion to any color.
- 15 September 2013Hybrid mana symbols, monocolored hybrid mana symbols, and Phyrexian mana symbols do count toward your devotion to their color(s).
- 15 September 2013If an activated ability or triggered ability has an effect that depends on your devotion to a color, you count the number of mana symbols of that color among the mana costs of permanents you control as the ability resolves. The permanent with that ability will be counted if it's still on the battlefield at that time.
- 1 February 2014If the player can't sacrifice a creature (usually because they don't control one), Mogis will deal 2 damage to them.
- 24 January 2020Counters put on a God remain on it while it's not a creature, even if they have no effect.
- 24 January 2020If a God stops being a creature, it loses the type creature and the creature type God. It continues to be a legendary enchantment.
- 24 January 2020As a God enters the battlefield, your devotion to its color will determine whether any replacement effects that affect creatures entering the battlefield apply to that God. Because replacement effects are considered before the God is on the battlefield, the mana symbols in its mana cost won't be counted when determining this.
- 24 January 2020The type-changing ability that can make a God not be a creature functions only on the battlefield. It's always a creature card in other zones, regardless of your devotion to its color. It's always a creature spell while it's on the stack.
- 24 January 2020If an effect causes a God to lose all abilities, its ability that causes it to stop being a creature still applies if appropriate.
- 24 January 2020Your devotion to two colors is the number of mana symbols among mana costs of permanents you control that are the first color, the second, or both. If an effect counts your devotion to two colors, a hybrid symbol that is both of those colors is counted just once.
- 24 January 2020If a God is attacking or blocking and it stops being a creature, it will be removed from combat. It won't rejoin combat if it resumes being a creature later during that combat.
- 24 January 2020When a God enters the battlefield, your devotion to its color (including the mana symbols in the mana cost of the God itself) will determine if a creature entered the battlefield or not for abilities that trigger whenever a creature enters the battlefield.
- 24 January 2020The abilities of Gods function as long as they're on the battlefield, regardless of whether they're creatures.