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Most of an Opt for not-necessarily-Blue mana

During your Battlephase, if this card makes a second attack, destroy the opponents monster before the damage step

Two immediate options that come to mind are Jodah, Archmage Eternal, which basically lets you cast this for WUBRG and then net yourself 5 mana to help cast the spells you reveal, and Mizzix of the Izmagnus, which can cast this 10cmc spell for as low as RRR

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Your opponent wont have enough mana to drop a 5- or 6-mana planeswalker and pay an extra 4 mana

Because of the way this is worded, it can actually exile multiple creatures, as long as you can keep it around and keep transforming it