Usually players will have to choose another card with the same character to use Shift, but in the case of Chip n Dale, Recovery Rangers, it can be used to Shift a Chip or a Dale card, which makes it quite a bit more versatile than a normal Floodborn card
When a Creature Phases out, they don't technically change Zones, and all of their Counters, Auras & Equipments stay attached to them
I believe Slip Out the Back to be the best of them, but cards like Loran's Escape, Blacksmith's Skill, Revitalizing Repast, etc
Even outside of storm decks, these are still good cards for red Commander decks looking for a leg up for their mana
Its got theoretical upside against double Grasp of Darkness and theoretical downside versus lifelink fliers, but mostly its a bigger Stormbreath Dragon