In general, with 4 different ways to be behind, it should be easy to put yourself in a position to trigger at least 2 of them
Being a creature means it can be plopped on the battlefield with Defense of the Heart or Natural Order for far less than seven mana, or via Reanimate / Animate Dead
If a permanent had counters or stickers on it when it phased out, it will have them when it phases back in
While Cinderella works especially well in decks that focus more heavily on princess characters, she also does let you trigger her effect by just playing her, making her a solid draw/ink engine in-and-of-herself
If I had to name the quintessential Blue creature, I would likely choose the Sphinx
But there are no mono-green blink commanders