Overall id say the weak point is the master balls
If Tymna and Bruse Tarl are your commanders, your deck may contain cards with red, white, and/or black in their color identity, but not cards with green or blue
Theres nothing mechanically unique, theres only one card in all of this that hasnt had a premium printing before
And, make no mistake, filling the 'yard accounts for half if not more of the power of this card, especially when you can build around milling yourself with your pick of Delve, reanimation effects, Delirium, Undergrowth, Karador, Ghost ChieftainKarador, Ghost Chieftain, Muldrotha, the GravetideMuldrotha, the Gravetide shenanigans
Designing a New Pokmon Card How Card Templates Are Created Card templates establish the structure of every Pokmon card