Uncivil Unrest

Riot has always been a hedge mechanic: haste when you need the swing now, a counter when you have time to grow. Handing the whole board that choice is a fine payoff by itself, but the second clause is what changes the calculus. The counter half of riot stops being the patient option and becomes a damage doubler, because every creature that entered with a +1/+1 counter now hits twice as hard. The two abilities answer the question riot always leaves dangling: why ever take the counter over haste? Here the counter is the aggressive line, not the conservative one, and it applies to everything, not just combat. The doubling is a static ability generating a replacement effect: it rewrites the damage a creature bearing a +1/+1 counter would deal to any permanent or player before that damage happens, so it scales with pingers, fight effects, and direct-damage triggers, not just attacks. It only ever cares whether the creature carries a +1/+1 counter, which means anything that piles counters onto your team (proliferate, other anthems, sacrifice-and-return loops) feeds the same engine riot started, and a token that ends up with a counter doubles its damage too. The one line drawn is at the giving end: only your nontoken creatures get riot in the first place, so the investment being rewarded is a permanent board you built, then let the doubling turn that investment into lethal math rather than just a wider battlefield.