Of course, you could just go all-in on spells, in which case you could stuff your deck full of things like the Ultimatum cycle, all of which do obnoxious things, or Clone Legion, which lets you copy an opponents creatures and make tokens of each one
Other land combos lean on the graveyard
Selesnya (white-green) is one of the most consistent two-color combinations in Commander, and the combination of card advantage from Monarch with steady mana ramp from Vibranium gives this deck a genuinely strong, low-variance game plan
The only deck I know of that fits this description is Bubble Hulk
Its not as powerful as a threat on its own, but most of the combo potential is still there
Monsters, it would probably be a $20 mythic alongside Stormbreath Dragon