In terms of fighting fliers, Grappling Sundew, Wall of Tanglecord or Traproot Kami offer a delay, there is a lot of cheap spot removal like Aerial Volley, multiplayer options like Clip Wings, sweepers like Corrosive Gale/Hurricane/Skyreaping, options to turn flying into a downside like Bower Passage/Dense Canopy, utility answers like Crushing Canopy and Crushing Vines, 'total shutdown' effects like Elvish Skysweeper, Scattershot Archer or Gravity Well
The child version of me is off somewhere crying from this comment
The effect to make Blood tokens for creature tokens is minor but feeds into its other effects if you have no other way to generate artifacts
Secret cards can be unlocked by defeating certain characters
Or was it the Star Trek CCG
Legendary Creature - Horror Slug Removal (CTRL to add secondary) Theft Inevitable Betrayal Suspend 3 (Rather than cast this card from your hand, pay and exile it with three time counters on it