Interesting notes.

I once encountered a bug with the Phoenix. If you have a Phoenix and create a phantom, let the enemy kill the phantom. Notice that the Phoenix is invisible, but the phantom is still there and moving. This is definitely a cheating bug. A similar bug exists with the Griffin: use the "Strike from the Sky" ability, and if it has an ability like "Surveillance," it will kill the Griffin, but it will still land. The number of creatures won't be visible, but the Griffin will remain active. Go ahead and exploit it, bug users.