On Serra's Wings

Legendary Enchantment - Aura

Enchant creature
Enchanted creature is legendary, gets +1/+1, and has flying, vigilance, and lifelink.

"The spirit of Serra raised Brindri high and commanded her to keep the balance."
—Song of All, canto 524

2018-04-27 If you control two On Serra's Wings attached to two creatures you control with the same name, the "legend rule" applies to the enchanted creatures and to On Serra's Wings at once. You can choose to keep the On Serra's Wings that enchants the creature you wish to keep.
2018-04-27 If you control two permanents with the same name but only one is legendary, the "legend rule" doesn't apply.
2018-04-27 Multiple instances of flying, vigilance, and/or lifelink on the same creature are redundant.

Card is in preconstructed decks:

mtg.wtf