Thankfully, we've just learned a whole lot more about the upcoming MTG Final Fantasy Universes Beyond set thanks to this flood of great spoilers
It's important to note, these combos all allow the player with priority to stop it
Act on Impulse relies on you having plenty of mana available
Teferi, Hero of Dominaria [Best Card Advantage Engine for Control] The history of MTG planeswalkers has a recurring theme: if a control deck is winning, Teferi is probably involved
Even if you don't have counter magic good players will not make critical plays into you if they can avoid it
In commander, where only one copy is allowed, it would be nearly impossible without Templar Knight's final ability, which allows you to include any number of copies in your deck