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You may put an additional counter of that kind on that permanent

Sad turn of events for our flaring horse

Put those cards onto the battlefield, then shuffle

While Heartless Hidetsugu from Betrayers of Kamigawa predated it, Niv-Mizzet was the driving force for changing it to only combat damage

If Golden-Tail Trainer's power changes after costs are locked in, or if Golden-Tail Trainer leaves the battlefield while you are activating mana abilities or paying those costs, the cost reduction effect won't be affected and the total cost to cast the spell won't change

That gives it a group hug edge, granting your opponents' creatures a benefit as long as they attack someone other than you