It does have its downsides, it only works at sorcery speed and costs two mana, but it's a quick way to go search your library for a Sol Ring or Sensei's Divining Top, so it ain't half bad
The other thing is that you want to control how much paint youre picking up for each area
I still think the current printing of Nadu is better
Whether you're building a casual pod or surprising the meta with an aggressive swarm, Rin and Seri have your back
Whether you're learning the Disney Lorcana rules, taking one of the best Lorcana Starter Decks and beefing it up, or building a deck from scratch, there's nothing quite like opening 24 Disney Lorcana packs off the bounce
The other options are ones that are cheaper but lose you a card (Such as Vampiric Tutor), or cost more mana (Diabolic Tutor) or only tutor for a sub-set of cards (Open the Armory) or otherwise have serious restrictions on them