Cards that care about creatures with power 4 or greater fit naturally here, since green and red already push you in that direction
The archetypes which want those kinds of cards are red-white, green-white, black-red, and (to some degree) green red
If youre looking to build a deck thatll send shivers down your opponents spine, or just devour anything they throw at you, an army of the living dead is the way to go
Caustic Caterpillar is perfect here as a cheap body that can be sacrificed for a Naturalize
Here's Kyle's Over/Under predictions for all 85 mono-color base set legends, from Thor to Squirrel Girl
Emberwilde Captain deters incoming attacks by dealing damage to an attacking opponent equal to the number of cards in their hand, so long as youre still the monarch