Możesz, karty zostają na polu do końca chaina, CL2 MST, CL1 Mirror Force podczas którego robisz substytut z odsłoniętego już MST
Tu masz oficjalny ruling:
If the effect of "Number 66: Master Key Beetle" was activated targeting a Set "Dark Hole" and afterwards, that "Dark Hole" is activated, other monsters on the field are destroyed by the effect of "Dark Hole", but by applying the effect of "Number 66: Master Key Beetle", sending that targeted "Dark Hole" to the Graveyard instead, "Number 66: Master Key Beetle" is not destroyed and remains on the field. (Furthermore, if that effect is not applied, "Number 66: Master Key Beetle" is destroyed normally.)