Felidar Guardian Felidar Guardian is probably one of the weakest cards to be banned in multiple formats
See, Dream Eater is the blue MYTHIC in GRV, and Cloudreader Sphinx is a COMMON
You want to hit your land drops anyway, so a cheap blocker that generates effectively free value is very welcome in a strategy that needs to churn through 60 cards rather than 20 life points
You could also go the infect route with a pretty good range of flying infect creatures in white and black, from Tine Shrike and Shriek Raptor to the black flying infect creatures I suggested for Brokkos
It works with everything from cards that were in Standard at the time of printing (Living Death, Recurring Nightmare) to strategies recently printed (Boneyard Wurm, Spider Spawning) and everything in between
However, players may be able to play Spider-Man 2099 on their opponents turn by using cards like Emergence Zone or Leyline of Anticipation to cast the card as though it had flash