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I play Brainstorm. Using my 2 actions, I play Ancient Wisdom first, then System Reboot. I draw Unleash Potential off of System Reboot, do I get to play it for free now?

Both Brainstorm and Ancient Wisdom resolve top to bottom. When you play Brainstorm, then you play Ancient Wisdom, you must play Unleash Potential at that moment. In your case, youve moved past Ancient Wisdom and are continuing with Brainstorm, playing System Reboot. Its now too late to play Unleash Potential with your previous Ancient Wisdom.
Source: Wizards of the Coast (2019-10-11)    【Link to Ruling】
Tags: Ancient Wisdom, Unleash Potential, Brainstorm, Brainstorm