While in and of himself he would be a great card to have in limited, one of the block mechanics were "recurring" enchantments such as Rancor and Launch
Those amounts are then doubled to 4 and 6, respectively
Table of Contents show #55
Refunding 2 mana in the form of Treasures is great, since those Treasures can help cast the cards you exile on that very same turn
Immerwolf just says that your non-human werewolves cant transform at all
Back Sephiroth, One-Winged Angel Legendary Creature - Angel Nightmare Avatar Flying Super Nova - As this creature transforms into Sephiroth, One-Winged Angel, you get an emblem with "Whenever a creature dies, target opponent loses 1 life and you gain 1 life." Whenever Sephiroth attacks, you may sacrifice any number of other creatures