Planeshift Tarkir
Cunning Action. On each of its turns, the assassin can use a bonus action to take the Dash, Disengage, or Hide action. Sneak Attack (1/Turn). The assassin deals an extra 7 (2d6) damage when it hits a target with a weapon attack and has advantage on the attack roll, or when the target is within 5 feet of an ally of the spy that isn't incapacitated and the assassin doesn't have disadvantage on the attack roll.
Poisoned Dagger. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 5 (1d4 + 3) piercing damage.and the target must succeed on a DC 12 Constitution saving throw or become poisoned for 1 minute. At the end of each of the poisoned target's turns, it must repeat the save, taking 3 (1d6) poison damage on a failed save, or ending the effect on itself on a successful one.
Environment. Jungle, Swamp, Urban