The Yu-Gi-Oh trading card game has three card types: Monster Cards, which summon monsters you can use to battle
Like most Pokmon cards, the value of Eevee depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Hidden Fates)
Overall, it should see play in themed decks that can maximize its potential, but its effectiveness may vary depending on the current meta and available support cards
You can obtain the Blissey (3-Diamonds rarity) card by opening Wisdom of Sea and Sky: Ho-Oh from Wisdom of Sea and Sky set
Deification's last ability doesn't prevent damage
The simpler spells like Dark Ritual and Cabal Ritual can ramp you to your more important spells while upping the storm count while Tendrils of Agony can finish the job