An extra beginning phase means an extra untap, upkeep, and draw step, which turns Sphinx of the Second Sun into an extra card and double mana each turn
This is because it is a purposive card, you can put it in a deck and improve that deck with no prior knowledge of your opponents deck or who is on the play
War of the Spark was still located on Ravnica, but instead of focusing on the guilds, it was a "capstone event set" about a war between Nicol Bolas and several Planeswalkers
Whenever you cast a spell from anywhere other than your hand, you create a Food token
7 Lost Thunder Despite the unfortunate name (perhaps one of the most nonsensical set names in all of the Pokemon TCG), Lost Thunder manages to have a really compelling mix of Pokemon with intense attacks and dizzying defense what puts the set above is its counters to some of the most powerful archetypes available at its time of release