I also wanted some of the synergy cards to do things by themselves but be better in concert with how the deck worked
For example, Dragon's Claw, Llawan, Cephalid Empress, Yawgmoth's Edict, Blue Elemental Blast, and Reign of Terror
This can be fine if said cards are part of your build, but, on the other hand, makes the Trainer card useless if not
All of these cards are good in some way and you might even find one lower down the list to be more helpful for your specific needs, so dont feel like you need to grab from just the top 10
Dont forget that shroud also locks you out of targeting your creature with buffs or other equipment
Shadow Room Put 3 damage counters on 1 of your opponent's Pokmon