This negates the damage Pestilence and Pyrohemia deal to you, making it safe to go infinite and claim the win
Ideally you'll do this on the end step of the turn before you untap and then you win with a cherry on top like Chandra's Ignition
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Some spicy inclusions are Forsaken Monument which is the best of the best, Ugin, the Ineffable which doubles as card advantage and removal, Geode Golem which casts a 10 mana spell as a combat trigger, and Ebony Fly which can give Kozilek flying
But allowing spells to be copied for the low price of one mana plus tapping inevitably leads to thoughts of combo, especially given how many cheap instants and sorceries can untap your creature
However, Rev doesnt have to risk itself in combat to do it and actively helps by giving deathtouch to an attacking creature you control