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You choose both targets if you cast the spell

Originally meant to be the fixed Force of Will, Force of Negation accidentally dipped its toes in Modern Horizons juices for too long and instead went on to simply become Force of Will #2

Ive already covered Dockside, but for a quick overview of the various ways to generate infinite mana, see above

On the extreme end, theres Enter the Infinite, but with a Reliquary Tower and some draw spells, in creature form like Arcanis the Omnipotent or the classic way with Mystic Confluence or Jaces Ingenuity, you wont need to be full-throttle

That's yours for stuff like heroic or your foe's for interaction

Youll want as many cost reducing effects as you can get, so I suggest stocking up on Sapphire Medallion, Herald's Horn, and Urza's Incubator if you plan to go the sphinx tribal route