Niambi checks a lot of boxes
Ursulas Return will launch first in local game stores and inside Disney parks on May 17th, followed closely by retail, online outlets and The Disney Store on May 31st
It can be recurred, looped, and flickered to your hearts content
Kaargra Warfang isn't as bad, but her favor pool mechanics, cards like "Fickle Fans", and a "The heroes cannot win" rider on her flip side mean a dire situation can result in Hero victory, or dominant play from the Heroes can be stalled out into a sudden defeat, with only so much that can be done about it
Producing board presence via forage is a great payoff for cracking Food and buffing your team is a great payoff for filling the deck with squirrels
My worry is that Birthing Pod wouldn't be good enough, which might tarnish its memory as one of the top cards in one of the best eras of the Modern format