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
Its also the hardest card here to call
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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
Or was it the Star Trek CCG
Fighter of the Night Man