Ten Wizards Mountain

Both halves of this plane wire the planar die to the same aggressive plan, and the design point is that they compound rather than run in parallel. The first ability triggers on the act of rolling itself, regardless of the result, so every spin (chaos, blank, or Planeswalk) drops a +1/+1 counter onto a creature. That matters because it decouples the payoff from the roll's outcome: even the turns you fail to hit anything still fatten a body, which sands off the worst part of most planes, the dead roll that advances nothing. The chaos trigger then cashes the accumulated ground presence into the air, handing your team flying for an evasive alpha strike on the turn the symbol comes up. Counters build the board; flying makes it lethal later. So the plane rewards going wide and staying parked, and it punishes an opponent who lets you keep rolling while your creatures grow. That dependence on the die is also its ceiling: the whole engine is gated behind an action you cannot reliably control, and a plane you cannot roll toward when you want the counters, or away from before the alpha strike lands on you, is a lever with a random handle. It is a functional, single-minded piece of the Planechase variant rather than a card straining the type line, but among planes that ask for a deck built around them, its two effects at least pull in one direction.