Worst/Best Mechanic and Evergreen Mechanic

[Kaworu, the Fifth Child]

Hexproof, double strike, and indestructible are awesome.

Otherwise:
Cipher, in everything I've seen, is the most broken thing ever. Miracle and Undying are nice. Phyrexian mana, if counted, is OP. Iverload is great at triggering things, devotion is powerful but no fun... Blah!

Cipher? Broken? Sarcasm? If not explain lol

The ability is broken on most evasive things, which BU has, is broken in theory, but all the cards with it suck.

[Moneekahh]

Hexproof, double strike, and indestructible are awesome.

Otherwise:
Cipher, in everything I've seen, is the most broken thing ever. Miracle and Undying are nice. Phyrexian mana, if counted, is OP. Iverload is great at triggering things, devotion is powerful but no fun... Blah!

Cipher? Broken? Sarcasm? If not explain lol

The ability is broken on most evasive things, which BU has, is broken in theory, but all the cards with it suck.

I could see it being good if they ever put it on a powerful spell, but for now it's just not good. I don't know if it could ever be broken. All of the other mechanics you mentioned are much better than cipher. Lol.