In combination with classic cards like Sun Titan, Emeria Shepherd, and Karmic Guide, it will be hard to lose your entire board if you can keep Celestine in play
And I like creature type mashups like a horse with a fish
Well, theres actually nothing in the Commander rules that says you cant generate mana outside of your Commanders identity, so lands like City of Brass, and especially Urborg, Tomb of Yawgmoth, will let you cast this for three in any deck
I was really looking forward to overhauling this deck with cards from Zendikar Rising , but for now it will do just fine
Consider that there are only two ways to guarantee you a Treasure on Turn 2 at common and one of them is Mimic
Even if there's nothing tapped for her to kill, her abilities make combat a nightmare, as she can create a blocker or grant first strike to an existing creature