Legendary Dwarf Blacksmiths

When Legendary Dwarf Blacksmiths enter the battlefiled, you get an emblem with "Creatures with
a string counter on them can't attack or block, and
its activated abilities can't be activated."

{t}: Put a string counter on target creature. You can
only activate this ability if you control a Bird, a Cat,
a Bear, a Fish, and a Mountain.

Congrats to anyone that knows what this is
referencing, good luck.