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With access to enough colorless mana and a creature that generates mana on ETB, Displacer can set up easy infinite combos, one of which was even possible in its Standard format alongside Brood Monitor and Zulaport Cutthroat

There are plenty of Planeswalkers with powerful ultimate abilities that you can activate right away

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As the EDH format allowed only one copy of any given card in a deck, the Highlander part of its original name was, of course, a fitting one

How you answer these questions will vary based on your playstyle and deck, so dont be afraid to experiment until you find a blend of mana ramp cards that works for you