If you want to kill through combat damage, you can turn Volrath into either Cultivator of Blades or Wild Beastmaster and give all your other creatures +7/+7 when attacking, or go for an infect kill by turning Volrath into Jodah's Avenger, using its ability to give him double strike, but before the ability resolves turn into Blighted Agent to attack as a 6/4 unblockable infect double strike one-shot
This type of natural selection is called stabilizing selection, which pushes the population toward the average trait rather than the extremes
While Raichu can easily do 140 damage with just one single move, discarding all of its energy makes it mostly unplayable outside of this strategy
The potential to go on a major coin flip streak might seem impressive, but Celebi ex/Serperior is a lot more consistent with its damage output at the cost of less energy
How many uncommon cards would you expect to get from a full booster box of 396 cards
[1] Put a +1/+1 counter on target creature