by Benkyo
"Use" is not a highlighted term in the rules and I do not think it has such a specific meaning. Taking a die from the source and manipulating it for an effect is "using" it in any standard syntax. I'm inclined to agree with the posters upthread that if you want the +3 effect of "Who needs magic?" you must forgo any use of mana dice from the source for the turn.That said, I see no reason why you couldn't use a mana die on the Mana Steal tactic...