Helga, Skittish Seer gives me lots of mana and lots of cards, and I've really enjoyed playing her this year
The value over replacement seems low, and blue control decks already have to consider Cryptic Command and Jace, The Mind Sculptor as powerful-but-occasionally-cumbersome four-mana plays
Fairly cheap at only 4 mana, Dihadas first ability drains your opponents life and gives it to you, as well as protecting her from key threats
While my sights are set on creating even more bunnies, imagine making more token copies of your Wurmcoil Engine tokens or your Scion tokens in an Azlask, the Swelling Scourge deck
The Strategy Alrighty, the time has come
At the top of that list (for me at least) is Chip n Dale Rescue Rangers