The ability to recur itself, be regularly cast for one or two U mana, and the option to flashback spells that cost 2 (such as Manamorphose ) are all attractive reasons to include this card in UR
Zetalpa is the kind of card a new player looks at and is mind-blown by how could something with this many words ever lose
The effect triggers whenever Fairy Godmother, Mystic Armorer quests, granting all of your characters Challenger +3 - boosting their strength by three when they challenge an opponents character - and giving them the ability to return to your hand when banished in a challenge
(6/16/2023) If the creature you choose as your Ring-bearer was already your Ring-bearer, that still counts as choosing that creature as your Ring-bearer for the purpose of abilities that trigger "whenever you choose a creature as your Ring-bearer" or abilities that care about which creature was chosen as your Ring-bearer
If you regularly build and pull apart decks for several formats, your sorting needs will be different from someone who only plays a few Standard decks, or from someone thats looking to own at least 1 of each card in a set
Sanctuary Warden If Inspiring Overseer was the best Limited common, Sanctuary Warden is the single most powerful card in the entire set for Limited