yugioh live twin deck master duel Building A In Live☆Twins, a comprehensive guide :

Cards like Starmie ex and Articuno ex have 130 and 150 respectively

To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of Danitha Capashen's last ability)

Centered around the idea of potential, the more flexible variants of the Red-Eyes Black Dragon make appearances as early as The Sacred Cards

Having its ability to hard cast from the graveyard is also a good backup if you arent able to cheat out something from your graveyard or if your reanimate spells are countered