mewtwo and mew pokemon cards 71/236 & TAG TEAM GX | Rare Holo GX Card [Colorless][Colorless] Mewtwo & Mew GX #SM191

The remaining card slots can be filled with Potion or X Speed item cards to fill out the Mewtwo ex deck

Combine it with Bloomburrows Starscape Cleric (and other options), and then all you need to do is make the opponent lose a single life to start a combination that wins on the spot

Cancel is the prime example of this

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I'd suggest removing four Mountains, three Swamps, and three Islands to make room for: Xander's Lounge Darkwater Catacombs Shadowblood Ridge Temple of Deceit Temple of Malice Temple of Epiphany Temple of Epiphany Crypt of the Eternals Vivid Crag Vivid Creek Vivid Marsh Mid-Budget Mana Base You can improve the mana base much more by removing 12 of the basic lands (four of each) and three of the worst dual-land cycle (Choked Estuary, Foreboding Ruins, Frostboil Snarl)