I don't like that, but she's pretty flexible, the most common things she's with are things that play with time counters, and then One with the Multiverse and Ovika, Enigma Goliath
Heartfire Hero is a best-in format card at the best of times, but it can be buffed by Flowerfoot Swordmaster for an extra whallop.There are a few non-Mice too, like Hired Claw and the ubiquitous Screaming Nemesis
Her other ability is Spoilers, which reads: Whenever an opponent scries, surveils, or searches their library, put a +1/+1 counter on River Song
I am very pleasantly surprised with the new set
You can practically run any Pokemon nowadays and find a way to accommodate their playability