If you dropped Bramblem Familiar earlier in the game to help smooth out your mana a bit, you can always discard a card to bounce it back to your hand, giving you an opportunity to cast Fetch Quest again
Magic 's first three-color set was Shards of Alara
Power Artifact Power Artifact turns many mana-producing artifacts into combo machines
At any point, you can remove three spore counters from a thallid to create a creature token that is a 1/1 saproling
Likewise, Mana Crypt was arguably one of the strongest mana rocks in Magic: The Gathering due to its incredible turn-1 potential, allowing the owner to have up to 5 mana by turn two with cards like Arcan Signet or the various allegiance-themed talismans
While I love The Gitrog Monster or Borborygmos Enraged, lands-matter had not spoken to me in the same ways most of the Commander product themes had