Ghostly Prison Within the Commander format, one of the most common win conditions is to attack your opponents, taking them out of the game with powerful creatures
You also get at least two Rare or higher cards
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Cyclonic Rift, Cyclone Summoner, and even Scourge of Fleets can help do this on top of cards like Damnation and Toxic Deluge coming down the turn before
Regardless, these cards allowing everyone to profit makes them a bit ambiguous in power level
In my years of personal experience, examining good decklists, and talking to people much smarter than me, 50 mana sources is about the right number for most decks to shoot for, usually 37 lands and 13 ramp sources for a general budget deck