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These factors do make it a little overrepresented on MTGA, and the play patterns are quite repetitive on the surface as the opponent, you pretty much just see them cycle a lot and then eventually lose on your end step

Baxcaliburs Super Cold ability lets you attach Water Energy anytime during your turn, perfectly syncing with Quaquaval ex

Why is this so good

Even though it hasn't been reprinted in any recent sets, it still sees a lot of play in the Modern format as well as Historic on MTG Arena.

If you have a way to loop it (like Crucible of Worlds plus Academy Ruins ), you can lock someone out of the game indefinitely