Just look at any Izzet (red-blue) deck in Historic, Pioneer, Modern, and even Legacy
While this 3/3 human Pirate provides all other pirates you control with +1/+1, its selling point is found within its triggered ability
The difference with Modal Double-Faced cards is that the flip side - literally in these cards' cases - is almost always terrible
(To scry 2, look at the top two cards of your library, then put any number of them on the bottom and the rest on top in any order.) Sorcery Color tag templates(None) Rampant Growth Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle
Those are green-blue, green-black, and green-red