The namesake card and main win condition is the green six-drop that has the ridiculously strong ability of getting two lands onto the battlefield when it enters the battlefield AND when he attacks
Mew V #251 Ultra Rare Mew makes the list for the first time as the #4 most expensive Pokemon card in the Fusion Strike set, this time as an Alternate Art V
You may have creatures you control with no abilities assign their combat damage as though they weren't blocked
SR Super Rare Marincess Wonder Heart X WATER Link 4 [ CyberseLinkEffect ] ATK 2400 DEF - 2+ WATER monsters Once per battle, during damage calculation, if this card battles a monster (Quick Effect): You can Special Summon 1 of your "Marincess" Monster Cards equipped to this card, also this card cannot be destroyed by that battle, and you take no battle damage from that battle
This isn't a one-off piece of lore that has been retconned either - Ruby, Diamond and Pearl, Heartgold and Soulsilver, Black and White, Black and White 2, X and Y, and Alpha Ruby and Omega Sapphire's Pokedex entries for the poor thing all make reference to this
If you never see lands (or draw nothing but lands) in your opening hands, its a sign your land count is too low (or high)