Reef Worm was mentioned as a great UB card, but its been good enough to also splash in BR or WB as well (assuming you have sacrifice effects)
Glow up with extended art, foil etched, and (new!) neon ink foil cards
First, it generates you infinite mana with the combo mentioned above, and second, its a great ramp piece when used with some of the four-mana ramp spells, such as Circuitous Route
This has a powerful effect, but "End the Turn" is more downside than upside, since your opponent gets to rebuild their board first
The fact that you can cast The Goose Mother for just two mana, or three mana and not feel bad about it, makes this card much more tenable to modern-day Magic than Krasis ever was
The question Ive had since seeing Aminatou is how her first ability will tie into the rest of the decks themes