If you want to make your own Cube using Power 9 cards, there are resources on how to build cubes all over the net
Relief Captain by itself is a 3/2 creature for four mana, which isnt very good in any format
Dont underestimate what Bubbling Muck is capable of though, as it can perform an excellent impression of High Tide in the right shell, and it can even pull off far more potent shenanigans when paired with blues ability to untap lands and recur sorceries
Its not great, but we can cast anything we draw from the first turn onwards, so its keepable
Powerful Mega Mewtwo EX card featuring Vanishing Strike, from the Korean XY8 BREAKthrough set, card 026/059 RR
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