Vamaev, Cunning Reflection

Myriad (Whenever this creature attacks, for each
opponent other than defending player, you may create
a token that's a copy of this creature that's tapped
and attacking that player or a planeswalker they
control. Exile the tokens at end of combat.)

The "legend rule" doesn't apply to creature tokens.

Whenever you cast an instant or sorcery spell that
targets Vamaev, Cunning Reflection, that spell gains
rebound.