It can never be the only removal spell in your white deck, but a few copies handle cheap threats to save that Get Lost for meatier problems
This is a huge momentum swing, and it makes Gilgamesh a powerful top-end threat for red equipment decks or samurai-focused builds that want to flood the board with gear in a single turn
Beagle Boys Small-Time Crooks can do a similar thing but the plan is more obvious
Combine counter doublers like Lae'zel, Vlaakith's Champion with extra combats from cards like Raiyuu, Storm's Edge to make Rograkh a threat your opponents can't keep up with
Clan Defiance It may not look sexy, but Clan Defiance is the best X damage spell in Gruul, and better than most Red options with its ability to shoot down two creatures as well as Blaze an opponent
This might as well replace an Island in control-oriented blue EDH decks