If you have a sizable force, you cant go wrong with mass pump effects like Rally the Peasants or Heroic Reinforcements, provided you're in the right colors
Most traders are looking for Type 2 (Standard) cards, and can just be completely turned off if you show them a bunch of rares from 2004
But, if you're mainly in it for the gameplay, the world design, and the nifty features, then there is plenty that would appeal to a newbie looking to acquaint themselves with Pokmon ROMs
While the number of Skeletons is fairly small (only about 80 Skeleton cards exist in Magic: The Gathering currently), the power of them is anything but small
Pokmon like Mega Kangaskhan ex appreciate the extra Energy acceleration despite not being Water-types, giving you another completely different way to build around Aqua Charge
There are countless mechanics this ability synergizes with