pokemon 2008 cards Moltres | Diamond & Pearl—Majestic Dawn Retreat Cost 3 Pokémon TCG 2008 Great Encounters

Stadiums aren't a huge part of the Cube, but if you ever find yourself revolving around a specific one, then Ninetales from Primal Clash (#21) should be a high priority

It has the requisite counterspells and boardsweepers, plus planeswalkers to accumulate advantage every turn

It pings the opponent (not their creatures though) when it enters the battlefield, and is a serviceable 2/1 for two mana

Mana Ramp Lastly, we have the expected mana ramp options for Boros, plus Patriars Seal, which can untap Rainbow in a pinch

Each opponent makes a token copy of it when it enters, and those copies are permanently goaded

I expect that to be all turned on its head once people get their hands on the product and get to brewing with the new sweet creatures