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Serum Powder was designed by Gerard Pfiefer
It can also just Commander damage people out of the game, given it grows itself and has Trample
In general, HP determines therefore how long your Pokmon can stay on the active spot but, in fact, it has many more implications in terms in Gameplay
Either way, this nets plenty of value for your land drops and uses all those extra lands by making them threats
Secret Rares, full arts, and alternate arts from special sets often hold the highest value