That loop is functionally infinite proliferate at parity on mana, which means planeswalker ultimates, Ascendancy counters, Sagas, energy, shields, experience counters
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If you untap Doctor Doom with cards like Umbral Mantle, Thousand-Year Elixer or Magewrights Stone, for example, you can set up multiple activations per turn, refilling your hand
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Its often helpful to slightly deviate from the generic build of a certain deck by including one or more cards for counterplay against tough matchups
You're still in early turns of Game 1, facing off with your green-white deck against your opponent's white-black deck