The counter for this is to go full on health rather than shield.

Do you have a video up load? I want to see this in action.

... If I Kaiten you, you're screwed. :/ Too squishy, and this is only good against squishy heroes.
Even so, assuming both players have an equal amount of gold farm, Ringo and SAW will be able to hit you 2-3 times, while you are Using Xretsu, and once more, before you can activate Kaiten. That's around 4 Shots, and if they hit 400 with 20% harvest, that's 480 regen. This should negate your Kaiten's Damage, (This damage is realistic; Because you have no armor) Add the part where they stutter, and in 1-3 more shots you should be dead. (If Ringo / SAW build any form of Shild/Hp, in which they should) The build has a 65% Pierce, which I agree, would make the damage 1000, but a Ringo/SAW with a Crucible, or dragon heart should still be left alive. Once your skills run out, you're basically dead.

That, or either I suck really badly, so don't listen to me.

Okay so I tried this build with taka and early game it is pretty good. The only problem arises when you do not have the gold mine and you can not get shatterglaas. Also if the opponent has crucible it seems to lose the effect.

This was pre-update where BM was altered.

Broken Myth and Piercing Shard have the same shield pierce (15%). Since the passives for each Broken Myth will not stack, it is pointless to have more than one Broken Myth at once.

Also, Taka will be too weak early on to rely on his abilities, so going for crystal or shield pierce right from the start makes Taka fall behind too easily.

The thing about this build is that negates all shield. So there is no counter and ouch, if you manage to get a shatterglass in there.