Jet Medallion, Bolass Citadel, draw spells, tutors, and black cards that lack colorless requirements in their mana costs tend to work best with Krrik, as they help you stretch your mana and card access into ridiculously explosive turns that can win you the game on the spot if your opponents dont have access to any interaction
However, collectors are highly anticipating special Universes Beyond rarities, including potential serialized "Cosmic Foils" that could become some of the most valuable cards of the year
You'll draw, nice, and then you can exile an artifact or critter from your hand and make a token copy that's a 3/3 Golem artifact too
Its gone from being a couple of dollars not long ago to climbing to around $15
The graveyard is a resource we can abuse