Borborygmos
The Gruul guild's first marquee legend wants to do something the guild's color pair has always been bad at: build a board over multiple turns. Most Gruul payoffs are about the single big swing, and Borborygmos arrives in that tradition as a seven-mana trampling body that demands the swing land. But the reward warps the math. Connect once and every creature you control fattens permanently, which means the second hit is bigger than the first and the third bigger still. This is a snowball engine grafted onto a beatstick: the counters do not go away when Borborygmos dies, so even a single connection leaves a wider, harder-to-sweep board behind. The trample is doing structural work here, not just flavor; against a chump blocker the trampled-over damage still triggers the counter distribution, so the defender's best line (gum up the ground) is exactly the line that lets the engine fire anyway. The tension the design resolves is that Gruul's overcommitment problem (dump everything, get blown out by one removal spell or sweeper) gets answered by a payoff that makes overcommitting safer the longer it survives. It is a slow card for a fast guild, and that mismatch is the whole reason it reads as a build-around rather than a curve-topper.

