If all units were to compete Wimbledon-style...

[Zechnophobe]

Early Phoenix is amazing, I agree. Even Order 2 mature phoenix's will pull through the hardest part of the game (Rusty anchor) very nicely.

Late game I use it as a 2-of tank. Once on the first turn to light things on fire and lock down an archer stack, and again when it resurrects. It has similar utility to Demon Portal.

Now, Nature's Call.. there's a spell I cringe every time I pick up a scroll for it.