Many decks interested in wraths want to play blue anyway, and being uncounterable is way more relevant than preventing regeneration, since its mostly been phased out, and common protection spells use phasing or indestructible
He can be shifted for four, making him cheaper to play, and he lets you play a song card of cost four or less for free whenever he quests
The Archimedes - Electrified Owl card depicts the owl with an electrified effect, which is significantly more striking on the Enchanted version of the card than on the regular release
Its packed with powerful cards, flavourful callbacks, and even reprints like [[Dark Confidant]]
I believe it breaks down to several factors: Choices The best discard cards create interesting choices
Four mana for five damage is fine, and the potential to deal a point or two to your opponents dome is a nice bonus