Dedicated myriad builds can flood the board and overwhelm opponents before they can stabilize
The best I've seen in the past is the mid-$60s, but we've been looking at the high $70s on this for a few weeks before this record-low drop
Blastoise is quite popular too, which is another reason for the increased card price
When Zenos turns into Shinryu, Transcendent Rival the alternate win condition reads, When the chosen player loses the game, you win the game. While somewhat reminiscent of cards like Ramses, Assassin Lord, Zenos asks you to jump a lot less hoops, and can be activated at instant speed during your opponent's turn if you kill your first friend
Five mana for a 3/5 Reach isnt too bad, and the effect is just a mostly-better Morbid Opportunist trigger
This is according to transactions on their marketplace, so it is does not account for listings from other online sources such as eBay