Once per damage calculation involving this card and your opponent's monster: You can send 1 EARTH monster from your hand to the GY
"Strength" is slightly debatable - a card being Water-type alone doesn't make it stronger - though you could argue the fact there are so many equally strong Water-type decks, more than any other type by some margin, is the definition of strength
Instead, they might give it away on the last session to anyone whod played in the season or maybe attended more than once, etc
But remember, not all Pokmon cards will command high market prices, and investing in them is risky
Artifact Creature Construct Double strike Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.) When this creature enters, for each opponent, put up to one target nonland permanent that player controls into its owner's library third from the top
Given the massive popularity of the Sinnoh region, the golden collectible is going to be one of Lost Origin 's most valuable cards over time