For example, if you chose Kithkin, you could spend the mana to activate the ability of a Kithkin permanent you control or a Kithkin card in your hand or graveyard
The infect strategy, while not having direct support since Phyrexia: All Will Be One, has still been improved thanks to additional cards that care about counters
You could also take the route of not bringing Vendilion Clique in at all, which will result in being able to bring in Counterspell without having problems with what to bring out
This is almost essential in any strategy that revolves around facedown creatures, but its also a solid chaos piece elsewhere
Not an easy choice since Selesnya capitalizes on both situations
That being said, Ragavan is still an insanely powerful one-drop that threatens both mana acceleration and card advantage, and there's not much more you can ask for at one mana