UR Aggro wants to go wide with cheap cantrip-fueled threats like Slickshot Show-Off, so Doc Ock's Tentacles and Basilisk Collar are too slow and situational against a tempo deck racing you. Chainsaw comes down and immediately deals 3 damage to a creature, picking off an Elusive Otter or Slickshot Show-Off on arrival, then grows as the game goes to combat. Voice of Victory shuts off their ability to interact with your turn via instants and sorceries, which is huge against a deck full of Burst Lightning and bounce effects, while also pressuring with Mobilize tokens. Stay aggressive and keep your curve low to beat them to the punch.