Toggo and Siana are rarely picked as commanders or mainboard picks, I think their replacement are much stronger and serve as great card advantage.

Paradox Engine, Immerstum Predator and Shelldock Isle, while being formidable cards, are too specific and used in very niche strategies.

Chopping Board:
Muldrotha, the Gravetide > Tasigur, The Golden Fang
Seasoned Pyromancer > Laelia, the Blade Reforged
Elsha of the Infinite > Samut, Voice of Dissent