While you could use this with any Electric-type deck, or even go based off the trees and slide some Grass-type Pokemon into these sleeve, you could go all out
Living Death and Reanimate are some of the best creature recursion in Magic: The Gathering
Pokmon TCG Pockets debut set is only the beginning though, with many generations of Pokmon cards still to come
There isn't any good direct comparison to Mangara's abilities, but the closest thing that popped into my head is Runic Armasaur, another creature whose card drawing ability is entirely dependent on your opponents' actions, making the card inconsistent where it sometimes draws you zero cards and sometimes floods you with card draw
Be sure you have at least a reason or two to spring for a fetch land, otherwise, it's worth it to save some money and leave the big spending for decks that need more from their land base