mtg card trader Magic The Gathering - Trade Secrets Art by David Gaillet. MtG Throne of Eldraine Common

Umbral Collar Zealot has the potential to unlock an aristorcrats style deck that can pressure on multiple dimensions, one of them being attacking, while the aristocrats plan is being set up

Add another rainbow in the background

Even then, getting information from your opponents hand is always strong, and outside of hyper-aggressive burn or creature decks, this is good enough as a 4x main deck card

But Im not sure how good a fit he is

This new Flynn Rider is a bit of a downgrade from The First Chapters Flynn Rider Charming Rogue, with no ability and only 1 Lore (albeit at a lower ink cost.) The big takeaway from this card is that a third Flynn Rider card could be coming in Rise of the Floodborn