Being able to regenerate itself doesnt matter too much when your opponents have no real reason to get rid of it
The cost and toughness are just within Constructed playability, and while paying for the ability stings, the combo potential inherent to the untap symbol means the adorable Bairn still keeps up with newer doubling effects
8 Helm of the Host Any card that can help you skirt the Legend rule is worthwhile, but Helm of the Host then takes it further by copying the creature for you
2024-02-02 If the spell requires any targets, those targets are chosen when the spell is finally cast, not when it's exiled
Alternatively, you can use bounce lands which auto-return to hand, and either make infinite kitties or grow your team arbitrarily big with Felidar Retreat, or just straight up murder everyone by exiling your library with Valakut Exploration