Since it can bounce itself each time, you net as many cards as you'd like to draw
Company: Wizards of the Coast Brand: Magic The Gathering Series: Strixhaven: School of Mages Item Type: Single Card Release Date: April 23, 2021 UPC: 0610622135242 Stock #: 360417 Our Guarantees to You, Our Valued Customer
Thats a big ask, but casting their binned Etali, Primal Conqueror for 4 mana is pretty big too
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Its ETB ability makes four other 1/1 tokens and the attack trigger gives it +X/+0 for each myr you can tap when the ability resolves
That said, because of the way the ability is worded, theres no link between which casting of Mairsil exiled which card (so its unlike imprint), meaning it still has the abilities of the previous cards