Brightfield Glider

Saddle is an activated ability. “Saddle N” means “Tap any number of other untapped creatures you control with power N or greater: This permanent becomes saddled until end of turn. Activate only as a sorcery.”

Saddled is a designation that has no rules meaning other than to act as a marker that spells and abilities can identify. Only permanents can be or become saddled. Once a permanent has become saddled, it stays saddled until the end of the turn or it leaves the battlefield. Being saddled is not a part of the permanent’s copiable values.

A creature “saddles” a permanent as it’s tapped to pay the cost to activate a permanent’s saddle ability.

Vigilance is a static ability that modifies the rules for the declare attackers step.

Attacking doesn’t cause creatures with vigilance to tap. (See rule 508, “Declare Attackers Step.”)

Multiple instances of vigilance on the same creature are redundant.