Does Steraks passive stack with the Phantom Dancer Shield?

No.

They all share the same effect.

will not stack their effects.

Same as

Only the strongest effect will activate.

no, they both have "lifeline" as a unique passive so they don't stack

Streaks, PD, Hexdrinker, Maw, do not stack.

The second passives that say “when lifeline triggers” still work. So if Maw triggered Lifeline and you had Steraks you’d get the tenacity.

Thats actually not true, identical value uniques don't stack. non-identical do