It's beautiful in speedbows and stallbows alike. Since Entropy has almost everything (damage, control, PC, QC, defence), Entropy mark in both those decks has even more uses now. I'm getting several 6 ttw's with speedbows that have huge defences up x)
Some more observations: you don't seem capable of getting Shards or Nymphs from Serendipity.
Some examples of games where you win with Speedbow-speed, but you're playing a Stallbow
I simply cannot lose against Elders. Huge improvement for the versatility of speedbows :>
I've also had some SoSe-assisted 4-turn wins.