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Improvise offsets the amount of mana you need by letting you tap artifacts you dont need untapped like Void Mirror and Damping Sphere, making this super well-rounded and insanely strong

Though it's got a pretty steep cost at two of each color of mana, Progenitus can be really annoying to get rid of for opponents

This is synergistic with the "flashback" and "jump-start" mechanics found in recent Magic sets (see "Preview: 'Magic: The Gathering - Ravnica Allegiance'")

And frankly, the only reason this hits back at #10 these days instead of a lot higher, is that the most commonly played multiplayer format, Commander, starts with 40 life instead of 20, so its not as painful there