The robot creatures fit a wide range of different decks
Candelabra of Tawnos can go wild if you get a land in play that produces multiple mana, and Candles of Leng will almost always draw you a card when you use the ability
The leader of the Hyozan Reckoners, he has an army of assassins and spies to do his bidding, all armed with poisons, cybernetics, and dark magic
Im pretty sure the only reason mono-red has nearly as many +1/+1 counter decks as blue and black is because of Ashling the Pilgrim, which is a funny deck, but not likely a great fit for the 99
Red Damage, Damage, And More Damage Red is often pigeonholed as The burn color, and Foundations took that idea and ran with it
Each game does involve large decision trees