Being able to repeatedly steal your opponent's legendaries while drawing an ever increasing amount of cards
These abilities work together great, as if Unesh manages to survive a single turn you're likely going to be able to unload two Sphinxes onto the battlefield, netting you a total of somewhere between two and six cards
Its a great early pick because it goes in any blue deck, and then it plays perfectly into your game of discarding threats while looking for reanimation spells
it cannot be blocked by just one creature
Given how quickly prices have been climbing, though, it might not be long before these are the cheapest option remaining
For comparison, a huge set like last years Silver Tempest had 76, including the Trainer Gallery, while the current 151 set features just 42