The passive is hilarious. It is like having a guardian angel but you are still alive. Probably the worst idea I've seen on here. Count out 4.5 seconds during a game. Yeah, that long. Also would have one of the most insanely good build paths in the game early, with the best stat setup for any one item in the game, and a passive that would essentially be a non-self cc zhonyas+ GA at the same time, for about half the gold cost of most first item power spikes.
LOL.
nonononononononnnononononoo. In no universe would this ever be okay. Even if the passive was for half a second, you are still basically gaining a shield for around 1k-2k that is automatically triggered. Even if it was an active, it would still be way too much. The only way this would ever make sense is if it was active, and 20% of damage was taken to mana for like a second or two, even that is incredibly powerful. On top of that, those stat combinations are unspeakably absurdly strong, even if it didn't have a passive you buy this shit first on every half-tanky AP in the game. What the hell. This even breaks magic damage in the game, since it injects another 40 possible MR on top of being a must-first-buy on pretty much every AP in the game.
Actually one of the worst idea's I've ever seen.