Trainer cards such as Electropower and Choice Band augment the damage output of Pikachu & Zekrom- GX to levels that can ensure one-hit Knock Outs on many Pokmon- GX
Cruel Somnophage Without the Blue side, this needs about three creatures in graveyards to be on-rate (and counting casting the Blue side, arguably closer to five.) Depending on creature density, that may not be too hard
"As a predominantly limited only player, I am worried about Spider-Man and balancing for sealed/8 player draft."
With the recent improvements, when the new reprint is opened, they will open exactly one copy of the new card, which will count as having collected four copies
Note that if a Poisoned Pokmon is Poisoned again (either via an attack or other means), the Poison will not stack, so its not possible to double or otherwise increase the amount of Poison dealt between turns
That track record alone puts him among the best mythic rare MTG cards for raw, unbalanced power