Sokenzan

The dice-roll payoff on this plane is one of the most explicitly aggressive designs in the Planechase format's toolbox: a chaos trigger that hands attackers a second combat and a second main phase in the same turn. That is the Kamigawa mountain-country flavor made mechanical, the samurai-and-warriors ethos of Sokenzan pointed straight at the opponent's life total. The static half is the setup and the chaos half is the reward: while everyone is on the plane, every creature in play (yours and theirs) is bigger and can swing the turn it arrives, which turns even a stalled board into a live threat once the planar die comes up chaos. What makes it more than an Aggravated Assault stapled to a plane is that the extra combat only untaps the creatures that already attacked this turn, so it rewards committing to the swing before you know the roll will hit rather than holding back. It is a symmetrical effect that is not symmetrical in practice: whoever has the wider, faster board when chaos ensues gets to cash a whole second turn of damage, and the haste grant means fresh creatures are never locked out of it. Built as a table-wide tempo accelerant, it belongs to the loud end of the Planechase design spectrum, the planes meant to end games rather than shape them slowly.