mtg conflux card Magic: the Gathering - Soul's Majesty Elemental Shapeshifter Maelstrom Archangel regular from Conflux

Theres a lot of sacrificing and burning going on, but Streets of New Capenna and Warhammer 40K gave us demon commanders that splash into other colors and do other things, and Final Fantasy brought quite a handful of demons too

Reasonably costed at three mana, rather than possessing a 0 ability that temporarily caused Gideon to function as a creature until the end of the turn, Gideon Blackblade features a static ability that allows it to automatically function as a 4/4 creature as long as it's your turn

See rule 704.) 309.7: A player completes a dungeon as that dungeon card is removed from the game

Not only is Landfall a fairly popular archetype in general, but tons of other decks use these effects, too