Does iceblink stacks in current patch if more than one sup wears that gem? Want to test it on my barb but maybe someone tested it already. Its a lot of skills which can trigger it and at least one of current meta gem van be replaced.
No, it does not.
Iceblink never stacked. I think it's one of those misleading bits of information around D3 that everyone copies (incorrectly), like the BS about diamonds on support to buff Conduit Pylon.