They come in and trigger effects on each turn like a saga, but while they're on the field can also block and attack and behave as normal creatures
The last ability of Clive's Hideaway will allow you to cast both exiled cards without paying their mana costs (assuming you control four or more legendary creatures at that time.) In a Two-Headed Giant game, Traveling Chocobo's second ability does not affect triggered abilities of permanents your teammate controls
I opened a Noctis, Prince of Lucis borderless foil thinking it was a Surge Foil (they have the same art) and went to sell it at a vendor, only to be disappointed at the $3 offer
Out of the box, it unfortunately struggles against some of the more well-rounded starter decks that have a bit more utility
Lorcana The First Chapter Booster Pack 18 In this pack, we got: Commons: Cerberus Three-Headed Dog, Tinker Bell Most Helpful, Archimedes Highly Educated Owl, Dinglehopper, Philoctetes Trainer of Heroes, and Peter Pan Never Landing Uncommons: Triton The Sea King, Flynn Rider Charming Rogue, and Reflection Rare or above: Mickey Mouse Artful Rogue (Super Rare), and Iago Loud-Mouthed Parrot (Rare) Foil: Jasper Common Crook (Uncommon) A decent enough pack with the Super Rare and Uncommon Foil
These cards all come from Turning Red, which is making its Disney Lorcana debut in this upcoming set