Reasons why Magician Crow is NOT OP:
1) Crow only has CHANCE of being activated after dying (not 100% every death).
2) Buying Ring + Cloak is 7k I believe, certainly too much to be played EVERY round even if you win each round. (Plus still vulnerable to ultimates like Lightning Strike/Flame Strike/ Void, etc..)
3) With the addition of lace to bypass the above ultimates, that's no 12k for a well rounded bird... even harder to keep doing.
4) Knife and gun are still visible (learn to LOOK CLOSELY >.<)
5) The bird is rather difficult to fly unless the map is very open, so being able to clutch by planting bomb / getting hostages in time can be difficult.
6) The above reasons are MORE than enough IMHO...
With respect to the invisible issue, I interject with reasons 2 and 4 above... Also, FAGABOND and RAPESCALION are invisible as well... Cloak in general is an item that requires a substantial amount of cash to buy, and even with this item you need to be adept at maneuvering with the bird at (1) hp w/o the ring or health... Rather than wandering into the open, try looking up the last guy's playerinfo and seeing if he's magician... odds are you'll be more cautious which (I would hope) would lead to you killing "players who suck" as they... well suck (according to you

).