After the changes to combat damage, Wizard Mentor became absolutely insane, allowing you to attack and block with complete and absolute impunity, since you could stack combat damage and save your creatures at will
Tapping and activating only as a sorcery will keep Sequence Engine from getting into Scavenging Ooze territory
FromTheShire: Maybe in Panharmonicon type decks you can break the symmetry enough for this to be worth it but most decks have quite a few ETB's that you're going to let them rebuy
You get to open a present and, while you don't know exactly what it is, it's something you assume you're going to want
Auras attached to it are put into their owners graveyards
If you dont know anything about Magic: The Gatherings recent Lord of the Rings expansion, or the craze around the One Ring, this whole situation might be a bit strange