In a Commander deck with K'rrik, Son of Yawgmoth at the lead, you can turn the black mana in your spells into Phyrexian mana, letting you pay two life instead of paying the cost
They're meant to be easy on-ramps to EDH, but the new cards, ease of use, and powerful reprints make them favorites for even veteran players
War of the Spark was the big test, and it went well, opening R&D to explore other new themes on old planes
Idol of the Deep King // Sovereign's Macuahuitl As with previous transforming double-faced cards, you always cast the front face of these cards (that's the face with the craft ability), and they always enter with that face up unless something specifically says they enter transformed, such as the craft ability
The build for this Aurelia is kind of open ended
What Size Should a Prerelease Deck Be