Market research showed that hybrid mana was the highest-rated thing in the original Ravnica block, and I believe it is still one of the highest-rated "mechanics" (it's a tool, not a mechanic, but that's what the market research called it), if not the highest, of all time
The Light Arcanine single (#12), which follows the Dark Tyranitar in the set, is also sought after
Top 10 Izzet Creature Untap Effects Dramatic ReversalDramatic Reversal Thousand-Year ElixirThousand-Year Elixir Staff of DominationStaff of Domination Patriar's SealPatriar's Seal Retreat to CoralhelmRetreat to Coralhelm Freed from the RealFreed from the Real Umbral MantleUmbral Mantle Intruder AlarmIntruder Alarm Thornbite StaffThornbite Staff Sphinx of the Second SunSphinx of the Second Sun There are a half-dozen half-combos on this list that you can peruse at your leisure, but suffice it to say, we shouldn't have any trouble finding ways to repeatedly untap our Izzet commander
These are the eight most valuable cards you can pull from Crystal Guardians
And then we have the ability to tap two Apes to make another
Instead, the focus with Labrynth is creating a deck with a heavy trap focus
