My cube's pox decks have been loving it. Being able to have mana to fuel Death Cloud/mana that doesn't die to Death Cloud is really strong. This card is in no danger of being cut.
Is this card as insanely slow as it looks? Beautiful artwork that I fear is wasted on such a slow card. I don't see it surviving long enough to trigger the flip almost ever with all the artifact destruction and taking 3 turns to hit.
It's a bit slow, but the payoff is huge. It's a slam-dunk in my Extended-Standard 360 and Modernish 360 cubes, and is great in my Vintage-Powered 540 which supports the Artifact decks.
This card does a lot of work and contributes to the win surprisingly often. I tested it without high expectations, but boy have we been surprised. Legit cube include for sure.
Check out my competitive Ezuri, Claw of Progress primer!
My 630 Card Powered Cube
My Article - "Cube Design Philosophy"
My Article - "Mana Short: A study in limited resource management."
My 50th Set (P)review - Discusses my top 20 Cube cards from OTJ!