Battle Trance

you take a step back and a deep breath, closing your eyes you enter a meditative state allowing you to see the battlefield from a more tactical view (reminiscent of a player looking at a chess board) your actions during combat become unlimited by normal combat rules, you get 3 action points per turn to spend how you see fit (3 actions, 3 bonus actions, 3 reactions or any combination of the three) Also as long as any action would take only one action to cast it can be cast as an action, a bonus action, or a reaction (i.e. misty step is normaly a bonus action, but now can be cast as a reaction on the fighter that just got knocked off a cliff to shunt them to safety) 

you are immobile for the duration and dexterity saving throws are made at disadvantage, however wisdom intelligence and charisma saves are made at advantage 

for the duration you are able to cast spells and use your action economy as if you are any player on your team (i.e. you can use your reaction to cast shield on your fighter to increase their ac by 5 and on your turn you can use your action to cast thunder wave from said fighter for the damage and a bonus action to cast misty step on said fighter to pull them from danger or push them close to the fight, paladins would be able to smite on another players hit and clerics could cast cure wounds as if that fighter had cast it on themself)

this spell can be cast at higher levels gaining 1 additional hour of duration per level of spell slot used

if this spell is cast at 4th level or higher it gains the effect of telepathy amongst your team 

additionally, if this spell is cast at 8th level it gains the effect of haste on everyone connected by telepathy