I really was thinking about calling this topic - 'Cheating in Action Economy' - but went with more neutral name. You were warned on spirit of this thread. 
I'm very much 'think one cool monster against characters to put on' Storyteller. I also have (in)famous cabal of Masters and Double Adepts in Mage 2E with five-six PCs ( depending on players showing on session ). I run combat with them and even started to 'cheat' in the game.
On last game sessions I gave them as enemy Triple Archmaster ( mage with 3 Arcana on dots 6+ ) the ability to use two mundane attacks ( because of 4 arms he have ) AND then cast spell ( cause he have high Time ) - i.e. two attack actions and one spellcasting action per turn. Still, players more or less easily just beat the Archmaster to pulp, with least damage! If he would be much more invested in fight that he could not recreate his body after 'death' - he would be devasted.
I'm starting to believe you cannot run combat against high level mages unless you have <Number of PCs>+1 full Actions per boss. I know, I know - it's 'cheating'. But letting PCs win with most powerful beings in universe just by mass beating 5 spellcasting against his 1 spellcasting - it's just feel to cheap.
I even think about making Time Archmastery spell for this:
Many Seconds in One (Time ••••••)
Practice: Dynamics
Primary Factor: Potency
Suggested Rote Skills: Athletics, Intimidation, Science
The mage can replicating flow of Time, allowing target to do many action in the same time. For each point of Potency on spell, target can do one more instant action per turn.
+1 Reach: By cost of one Mana target can do number of spellcasting actions per turn.

I'm very much 'think one cool monster against characters to put on' Storyteller. I also have (in)famous cabal of Masters and Double Adepts in Mage 2E with five-six PCs ( depending on players showing on session ). I run combat with them and even started to 'cheat' in the game.
On last game sessions I gave them as enemy Triple Archmaster ( mage with 3 Arcana on dots 6+ ) the ability to use two mundane attacks ( because of 4 arms he have ) AND then cast spell ( cause he have high Time ) - i.e. two attack actions and one spellcasting action per turn. Still, players more or less easily just beat the Archmaster to pulp, with least damage! If he would be much more invested in fight that he could not recreate his body after 'death' - he would be devasted.
I'm starting to believe you cannot run combat against high level mages unless you have <Number of PCs>+1 full Actions per boss. I know, I know - it's 'cheating'. But letting PCs win with most powerful beings in universe just by mass beating 5 spellcasting against his 1 spellcasting - it's just feel to cheap.
I even think about making Time Archmastery spell for this:
Many Seconds in One (Time ••••••)
Practice: Dynamics
Primary Factor: Potency
Suggested Rote Skills: Athletics, Intimidation, Science
The mage can replicating flow of Time, allowing target to do many action in the same time. For each point of Potency on spell, target can do one more instant action per turn.
+1 Reach: By cost of one Mana target can do number of spellcasting actions per turn.
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