all mtg world champion cards World, Champion, Celestial Weapon - Artifact - MTG✨CRUCIBLE OF WORLDS World Championship

While it will take completing a dungeon to maximize this cards power, Ravenloft Adventurer could still be a good sideboard card to bring in, depending on what your opponent is playing

It stops an attacker, it removes a blocker, it can protect your stuff from a Wrath, yours or theirs, you can kill tokens, you can re-trigger etb effects or you can just say "nothing will be killing my Kaya this turn"

Mono Black Devotion Decklist (Pioneer) Gray Merchant of Asphodel is absolutely the main reason to play this strategy

It happens

On their turn, they have to tap four permanents, which will often tap them out and cost them their whole turn