2 changelings + Coat of Arms = Infinite +1/+1 counters exploit

[Plus]

I think I stumbled into an exploit/loophole with coat of arms and changelings.

Here is how it works

You play 2 changeling cards (changelings are of every creature types)

Play a Coat of arms on one of the changlings (gives you +1/+1 for sharing a creature type)

So now basically since both changelings are every creature type, the one with the coat of arms will be sharing all its creature types with the other changeling and will get infinite (or maybe just the number of creature types that exist which is almost like infinite) +1/+1 bonus.

Is this a known issue thats fixed in M2010?

[Twanos]

Doesn't work that way.

Here is the ruling for coat of arms...

If you have a creature with more than one creature type, and another creature matches more than one creature type, you only count that creature once. You do not double count it because it has a double match. [Barclay 1998/06/10]

Note this ruling was isued June 10, 1998 and is still in effect so there is no exploit. sry.

[Plus]

Oh that sucks already made a deck with changelings and coat of arms was gonna try this exploit against my friends

Though maybe I can still pull it off if they dont know of this ruling