Solemn Simulacrum makes a nice blocker as well, as when it dies you can draw a card
Speaking of pillowforts, there is a downside to the pseudo-unblockable of shadow, which is that many of our creatures wont be able to block practically anything unless they lose shadow, so well use cards like No Mercy and Ghostly Prison (thats one way to think about Navidsons house, thats for sure) to dissuade opposing creatures from even wanting to venture into our confusing battlefield
Shardless Agent can easily cascade into these spells, leaving space for other spells at or above 3-mana to safely cascade past
Ragavan, Nimble Pilferer [The Most Valuable One Drop] Ragavan, Nimble Pilferer is the kind of one-drop that forces an answer immediately
Just as moving too soon can be a bad thing and cause me to overpay early, moving too late can mean I pay more as well