Cards like Delver of Secrets, Tarmogoyf, and Pack Rat shaped their respective metas, but theyre just outclassed in modern Magic
"Horus the Black Flame Deity" has powerful non-targeted removal effects that can either send 1 card on the field, or Special Summon itself while sending all other monsters on the field to the GY (which triggers similarly to the shared effect of the "four sons of Horus")
This definitely makes Emerald/Sapphire decks a lot more feasible, especially as players can potentially get this card into play as early as turn 4 (or earlier if Rise of the Floodborn introduces a lower cost Belle
It requires one energy to use and it has a base attack of 10, and does an additional 60 damage if your opponents Pokmon has damage on it
Alternatively, you can run a pure ex-deck as long as you have contingency plans in mind against your toughest matchups
Lets quickly run down what we know about the four decks, the contents of which will be officially spoiled over the coming week