Can a player using the third ability tap the controlling players mana for no reason? {Sorin Markov}
Sure! You make all their decisions for them. If you choose to tap their mana, so be it!
I've never really played with him. Can you make the other players creatures attack their own controller?
Or is there some sort of rule that says you can not attack yourself?
I guess that also brings up, would there be a difference between controlling their turn and attacking them with their own stuff vs. just attacking yourself?
The active player cannot be the defending player. Rule 506.2. And in Sorins rulings it says that even tho you control the player, that player is still the active player. Basically, you cannot attack anyone that is not an opponent.
Awe I had the same hope when I was going to get a Sorin :/ darn.