Its much more powerful than in Guilds of Ravnica
Krikk will even help you gain those precious life points back: he has lifelink, and he gets +1/+1 counters whenever you cast black spells
P/T Number 224b Language English Legal Formats Alchemy, Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pioneer, Standard, Timeless, Vintage Rulings (9/19/2025) To determine whether it is legal to play a modal double-faced card, consider only the characteristics of the face you're playing and ignore the other face's characteristics
Instead, as far as gameplay is concerned, aftermath cards are just flashback with wacky art and a bit of a twist: the card you cast from your graveyard isn't the same as the one you cast from hand
The funniest interaction I got in mind is playing it for 1 + 1 with Thalia, Guardian of Thraben on the board, and sweeping basically all the creatures from Human deck