Sol Ring [Best Mana Rock for Commander] Sol Ring turns one mana into two colorless every turn for the rest of the game
EDH decks across the Bracket system run it to protect themselves against countermagic and other forms of instant-speed interaction for a mere 2 mana
there are certainly decks that could make good use of its surveil ability and/or would have a lot of cheap spells to cast
Pyrohemia lets you spend just one red mana to deal one damage to everything, your Dinosaurs included, triggering all their enrage abilities, picking off any creatures with at least one toughness, and slowly whittling away your opponent's life totals
For every vote for "Time", you get to take an extra turn, and for every vote for "Money", you get control of target permanent an opponent controls
Zendikar Rising marks the death of a lot of sets in Standard, and that means that were on the cusp of the great shakeup that marks the beginning of a new era of Magic: The Gathering