Omastar BREAK retains the attacks, Abilities, Weakness, Resistance, and Retreat Cost of its previous Evolution
[Everyone Liked That] Taking aspects of Fallout , not just as a world but as a game, and translating them to Magic is my personal highlight of the set
Any time you attack with any creature, you can take an attacking Vampire you control and make it a Demon as well as being a Vampire
It allows you to tribute 1 DARK monster with 3k or less ATK, and then have your opponent destroy 1 card for every 500 ATK of that monster from their hand and/or deck (so if you tributed a monster with 1k ATK, they'd destroy 2 cards)
For the mana cost it can really hit hard or not
Especially when it has been created by Mizutani Megumi, the designer behind the popular cards such as Professor Sadas Vitality and Mortys Conviction