Ertai Resurrected Four mana is a lot of mana to keep up at any given time, and giving opponents extra cards isnt something you want to be doing, group hug decks excepted
12: Resculpt Im a little more willing to spend an extra mana on a removal spell than a counterspell because you dont always need it ready at the exact right time, you can wait until the right moment to answer something
You might also consider running Horn of Gondor to increase your human creature count, or Karvanista, Loyal Lupari to spread out +1/+1 counters on attacks, or even Cloaked Cadet for some extra card draw
A huge burst of keywords is much better for closing out games than a mana discount, and Cosmic Spider-Man comes down much earlier, too
Ramping into him early could be totally unexpected
Edgar Markov Forget being in the Top Five for Mardu