mtg demon support cards A Deal With The Devil you may cast an enchantment spell by paying life equal to its mana value rather than paying its mana cost. Demon of Fate's Design

And since he grants Indestructible to the creatures he cheats in for the turn, you can swing with total confidence

Both Vow of Wildness and Vow of Flight are key cards for this deck, they work perfectly in multiplayer because they allow your opponents to hurt each other, while you have immunity from attacks

(Landwalk is a static ability that restricts what creatures can block an attacking creature.) 702.13c A creature with landwalk is unblockable as long as the defending player controls at least one land with the specified subtype (as in "islandwalk"), with the specified supertype (as in "legendary landwalk"), without the specified supertype (as in "nonbasic landwalk"), or with both the specified supertype and the specified subtype (as in "snow swampwalk")

Its also an okay Commander card, though the fact that it only hits one opponent is kind of rough

The cube is a vast format with a variety of decks than can bring lots of pain really fast

This is doubly true when you consider Xyris other ability, which lets both you and the opponent he damages draw cards equal to the damage he deals after swinging in