Several subreddits saw hundreds of comments where players were coming up with interesting combo potential and theorycrafting synergies, for everything from Hellkite Tyrant and Ichor Wellspring to Chandra, Spark Hunter
Ultimate Nullification Unconventional Tactics Unfinished Business Unified Front United Battlefront United Front Urza's Ruinous Blast Valiant Endeavor Valorous Charge Vanquish the Foul Vanquish the Horde Vengeance Virtuous Charge Visions Visions of Glory Wake the Reflections Wanderer's Strike Warrior's Charge Wave of Reckoning What Must Be Done White Sun's Twilight Windborne Charge Winds of Abandon Winds of Rath Winnowing Wondrous Revival Wrath of God Wrath of the Skies
R&D has kind of soured on tutoring mechanics, so I think the future of this mechanics is also kind of dim
There's more things you can do to make Vishgraz scarier than Ixhel, such as double strike to dish out 8 poison counters per combat, Anointed Procession to double the amount of mites, blink to get more mites too,e tc
And Then Along Came Zeus deals damage to both characters and locations, allowing you to smite the board and potentially banish your opponent's most useful cards