changeling cards mtg War-Spike [Morningtide] – The Nerdporium 0.5 in Elegant gift box included Does casting a Changeling creature

At the beginning of each upkeep, everyone exiles the top card of their library, and you get to play your own plus any of the others with a lower mana value for free

Add in being able to get it into play easily via several graveyard strategies and Citadel is an easy inclusion

Credit: Wizards of the Coast Mishra, Excavation Prodigy BPhillipYork: This is fun, red loves looting/rummaging and this fits solidly into a game plan like that, especially if it involves reanimating artifacts in various ways

His ability costs 5 mana and requires the player to discard a card, which is expensive and makes it hard to enable an infinite combo