pokemon card meltan [M] Iron Intake Heal 30 damage from this Pokémon Melmetal (Genetic Apex #182/226, 3-Diamonds)

Even now that the competitive format has moved on, the card holds value

You can grow it as large as you want, and it generates treasure tokens when it dies

Because it had a keyword that also existed as a keyword counter (we called them "inheritable keywords"), the mutated creature would get a keyword counter with that ability

Exchange that card with the top card of your library., so you basically just end up losing the game and probably a Swamp, but if you are able to cast a Darkpact you get to essentially trade your opponent a Swamp for whatever they anted - pretty dirty and cheesy, especially if they flip over a spicy rare