Agatha of the Vile Cauldron The activated ability on Agatha of the Vile Cauldron looks too expensive to be practical, but you can get it down to as little as with a few modifications on Agatha
(I used it once before many years ago in a column during Soldier Week.) Also, was the trivia to easy, too hard or just right
"Hideaway N" means "When this permanent enters, look at the top N cards of your library
The only issue, assuming you don't consider costing ten mana an issue, is that resolving four cascades in a row can get complicated, especially when individual cascades hit other cascade spells mid-resolution
Oko homogenized deck-building so impressively that if your deck had even the slightest hint of Blue or Green, then congratulations
Outside of the Hydra box, Id look to make Gargos even larger and start killing people with commander damage