Uncivil Unrest is a rare Enchantment card from March of the Machine Commander (MOC), collector number 35. Current market price: $18.83, TCGplayer market prices via Scryfall.
Nontoken creatures you control have riot. (They enter with your choice of a +1/+1 counter or haste.) If a creature you control with a +1/+1 counter on it would deal damage to a permanent or player, it deals double that damage instead.