Not a great combat body, not a great blocker by any means
Ardyn, the Usurper Rarity: Rare TYPE: Legendary Creature SUBTYPE: Elder Human Noble CMC: 8 Mana cost: USD: $2.16 EUR: 2.02 TIX: 0.02 EDHREC RANK: 3901 (4/4) Demons you control have menace, lifelink, and haste
Combo strategies that depend on synergy will see their win rate tank as they have to discard a card every turn, losing the chance to combo off
All this combines to make a solid commander or an excellent addition to a deck
However, if you dont have a devotion to red of five or greater, Purphoros stops being a creature on your side, and the enchant creature from Control Magic no longer applies
Off the top of my head, in Standard and Modern, it prevents some or all of the use of the following cards: Every flashback card (in particular) Ancient Grudge Desperate Ravings Dread Return Dream Twist Faithless Looting Forbidden Alchemy Mystical Teachings Past in Flames Think Twice Unburial Rites Snapcaster Mage Narcomoeba Reanimate Exhume Every undying creature Every persist creature Gravecrawler Ichorid Ashen Ghoul Proclamation of Rebirth Polymorph Probably quite a few others 1) Drogskol Captain Hexproof is a very non-interactive creature mechanic, making it one of the more powerful mechanics to have been printed in recent years
