It's funny that the hardest counter for Baron Omens is not Uber, but Legend units. This baron is already kinda manageable with UL Legends like Naala, albeit you can still lose big time if you made many mistakes. But the addition Master Uril TF changes the game. He greatly powercreeps this Baron. Strong/Surge ability, combines with his own fast cooldown, stack up heavy DMG onto Baron Omens. Since most of his DMG source is from Surge and Strong ability, you can keep JohnLeon alive better than before. The CC ability also helps to control their Aku movement. With the Aku being out from the picture, the only danger left here is the GreGory. Thankfully, Master Uril, Naala, and Gridiron are enough to create necessary DPS to repel them. At worst, Stone Cat can give you quick defense wall to stop them. Once you deplete all three GreGory, you're done with the stage.
Extra note:
1. Cactus Cat can be replaced by Cone Cat. Cone Cat doesn't give extra benefit on Omens stages, but he makes EX stages more braindead to run through
2. Upgrade your Gridiron Cat to at least Lv49. Anything below would make him get juggled by JohnLeon.
3. 2 Free slots can be filled with extra units or Cat Combo.
Music used:
Late Arrival - Midnight Spaceport
• Late Arrival - 真夜中の宇宙港