While you could certainly just play Krrik fair as one of the 99 in a mono-black deck as a way to occasionally cast spells ahead of time, this legend shines in a deck built to truly abuse it
This will pair well with the new Decayed mechanic, as they both place an extra level of importance on organizing your graveyard
Infinite combos and Stax are far from the only ways to make a Derevi flicker deck dangerous, however
The prime example of this is Lingering Souls, which can't be reliably discarded, can't be reliably killed, clogs up the board, threatens Lily, can swing for up to 4 damage, etc
Casual Wizard decks arent all that popular any more, though, and I dont think Ive ever seen this card in play more than once or twice
Then your opposing death trigger from this dork are doubled