This is because whenever a land enters the battlefield under your control, each of your creatures are untapped and you gain an additional combat step
This latter view was primarily held by those more involved with the ONE PIECE Card Games gameplay rather than collectability because they were concerned about whether a promotional card with limited distribution would end up being gameplay-viable
You have to pay 3 life to get these as untapped lands which can start to add up, so be careful if you have Ancient Tomb as well
However, never underestimate the power of Dragon type Pokmon, which always seem to prove hugely popular among Pokmon fans
If you read my recent feature on misprinted Pokmon card collectors on Wargamer, youll have an inkling of where this is going
So happy AYAYAing, stay safe, and please drive friendly!