Cheapest priced copy (Commander 2015): $0.49 at Card Kingdom, near mint, their price list as of .
Daxos's Torment 
Enchantment · Rare · Commander 2015 · #18
Constellation — Whenever this enchantment or another enchantment you control enters, this enchantment becomes a 5/5 Demon creature with flying and haste in addition to its other types until end of turn.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2015 | 18 | Rare | $0.49 | — |
2 rulings from Wizards of the Coast
- 4 November 2015Although Daxos’s Torment will become a creature after it enters the battlefield, it doesn’t enter as a creature. Abilities that trigger whenever a creature enters the battlefield won’t trigger.
- 4 November 2015If the triggered ability resolves while Daxos’s Torment is already a creature, that ability will override any effects that set its power or toughness to a specific value. Effects that modify power or toughness without directly setting them to a specific value will continue to apply.