Crystal Maiden is the hard 5 for me. I pick her when my carries are very greedy and want to leave me starving.
I play Winter Wvyern like a 4 and keep roaming. The artic burn is very useful in ganks. I generally make my first rotation at the first night. Io is my go to support when I have trust in my carry. Playing Io requires great communication so I generally play him a lot in party. Rubick is always fun because you can steal enemy spells and beat them at their own game.
What are your favorite supports? I would like to know more supports and why do you like them so I can increase my support hero pool.