To ensure the longevity of your proxy cards, consider sleeving them with high-quality card sleeves
Similarly, if all of the attacking player's other opponents leave the game before Suppressor Skyguard's last ability resolves, the condition will no longer be true when the ability tries to resolve, the ability won't resolve, and damage won't be prevented
The deck starts by casting a number of powerful, efficiently-costed vampire creatures with strong secondary abilities including Clavileno (card draw, creature tokens), Cordial Vampire (+1/+1 counters), Drana (+1/+1 counters), Dusk Legion Duelist (card draw), Florian (filter/draw), Mavren Fein (vampire tokens), Nullpriest (lifelink, menace, reanimate), and many more
Are there any artifacts out there that might provide that card advantage you're looking for in colors that are lacking it, or for a deck where the normal draw strategies just don't fit
Skullclamp is an auto-include given most of your creatures will be in the 1-toughness range anyway
How about Splendid Reclamation or Planar Birth