Generally speaking, the two versions of Mew both have some pros and cons
If you need to catch up, here are the articles we've published so far: Announcing Arena Powered Cube Arena Powered Cube Design and Card List Dev Diary: Creating Arena Powered Cub e Additionally, thanks to Luis Scott-Vargas (for TCGplayer) and Paul Cheon, you can watch two veteran Magic players take Powered Cube for a spin here and here
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(9/25/2020) To determine "the number of creatures in your party," check whether you control a Cleric, whether you control a Rogue, whether you control a Warrior, and whether you control a Wizard
However, all this doesnt detract from the fact that M Ampharos EX is a great surprise card that can force your opponent to prematurely commit resources to the board