Grandmaster Wizard is powerful for the fact he draws you 3 spells but having a cost of 6 mana can be challenging to play against fast aggro decks
Some mechanics just ask you to reveal cards, but to do these cards still need rectangles in your hand, and the more the better for Osseous Exhale, Orator of Ojutai, or Martyr of Sands
Landfall triggers, Elf payoffs, steady value Nissa blends it all together, which is why shes a great pick when youre looking at best Elf commanders in MTG
Amazing flavor on this one aside, I'm not so sure about the rate on this one
Where the World Championship decks showcased the strongest strategies and combos from that season, Theme decks and their successors (Starter packs, Guild Kits, Planeswalker Decks, etc.) usually revolve around a specific sets mechanics and act as an introductory product more than anything else