When hes played with Shift, each opponent will lose two lore, setting them back in their quest
Gyarados' angry roar is perfectly captured along with its coiling serpent-like body
(Just look to Cyber Dragon, Lightpulsar Dragon, Hieratic Dragons, High Priestess of Prophecy, and Elemental Dragons, however bad an example that last one is.) Also, to mitigate the rarity of his effect every being used, I think that it would make sense to alleviate the conditions and downplay the effect slightly, such as: "You can Special Summon this card (from your hand) by Tributing 1 "Bird" monster you control, then, if that monster was "Bird Princess": Add 1 "Bird Queen from your Deck to your hand
Of a demonic entity upon you, burdening you, and keeping you down