This deck has plenty of bad cards, so replacing them should be top priority and help this deck be a little more effective
On the flipside, you could build a Y'shtola deck that doesn't focus on this Creature package at all, and you can win the game through alternate conditions, whether that's by dealing enough damage with Y'shtola herself or casting cards like Sheoldred, the Apocalypse, Bloodchief Ascension, or a personal pet card, Approach of the Second Sun
For an update discussion I recommend you to join the facebook group on magic counterfeit detection here
Borderless foil: Around $20 Borderless non-foil: Around $15 Foil: Around $17 Normal: Around $15 Quintorius Kand The only Planeswalker in the LCI set was Quintorius Kand
Phyrexia: All Will Be One rises to perfection with Elesh Norn and her legion of biomechanical zealots battling for the fate of the Multiverse
This means it powers up until the end of the turn when Im casting spells (a little like Prowess), but with the added bonus that big spells (of five or more mana) will create a token of it, which will also have haste and be ready to hit hard