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Magus needs to be in play, so why wouldnt we get rid of the self-exile clause

Elspeth, Sun's Champion: A planeswalker whose ultimate ability creates three 1/1 white Soldier creature tokens with flying, and she can also generate a single token every turn with her +1 ability

Rare and collectible cards

Searching for a town is nice given how many good cards care about having a lot of towns in play

Pile on the collectibility, and major upside if you can harness this infinity stone and you get an artifact that is truly legendary

After all, you get no built-in protection aside from your ultimate, and instead what you're mainly working with is a bit of card draw and ramp