Food Chain is bonkers here with Ghalta, giving you thirteen green mana to cast creatures with, and youll likely be able to recast Ghalta from the command zone again and maybe again for two green mana each time (charging up that Genesis Storm)
One way to do multicolor cards is to find an overlap between the two colors and push the power of the cards with the idea that if you spend both colors that can do the effect, you get something stronger than any one color could get
The more cheap instants and sorceries you play the better this gets but I have had as few as 6 targets and still been more than satisfied with Snapcasters performance
Surtr, Fiery Jotun feels pretty damn powerful all things considered
Aboshan, Cephalid Emperor (Odyssey/Torment/Judgment) If you opened up your first pack of Odyssey in an OTJ draft, there's few cards you'd want to draft over Aboshan
These are often strong in the sideboard of formats like Modern or Standard where you can bring them in when you know what youre facing