Click-Clack, Raving Dancer

Whenever Click-Clack attacks, you may copy the
next instant or sorcery spell you cast this turn
whenever you copy an instant or sorcery
spell for the fourth time this turn, untap Click-
Clack. Then if it's your main phase, there's an
additional combat phase after this phase,
followed by an additional main phase.
_____________
https://www.youtube.com/watch? v= LD
U_Txk06tM