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When you proliferate, you can choose any permanent that has a counter, including ones controlled by opponents

Optimus Prime, Hero / Optimus Prime, Autobot Leader +1/+1 counters is a less common theme for Jeskai, but you can pair Optimus Prime, Hero with creatures like Abzan Falconer and Envoy of the Ancestors to gain access to strong keywords, and Lae'zel, Vlaakith's Champion to boost counter production

Mechanics Newly dropped spoilers show that MTG Final Fantasy will be home to the first Saga creatures

Depending on the formats it launches into, it could be limited to just Historic and Alchemy, or it could potentially come to Standard and Explorer as well

Vivi can be hard to keep in play due to his notoriety (he did terrible things in Standard) but on the bright side, his mana cost is so low that it shouldn't be too hard to bring him back

Damage marked on permanents won't be removed until you actually get to the cleanup step (which will happen after your second end step), and "until end of turn" and "this turn" effects won't end until the cleanup step either