It's alright, when you really need the haste it might come in clutch, so as long as you don't rely on having real mountains too often it's not too shabby
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Like the other lords, it gives your Goblins +1/+1, but it also allows you to sacrifice a Goblin to destroy an artifact
Maui's opponents might best hope for a card that can banish him outright, as wearing him down in battle can be a brutal task
There are some Pokmon that have never had an ex or full art, and plenty for whom it's been 7years or more since they got some time in the spotlight
If you only want to dip your toe into competitive play, an ex Battle Deck (like Tinkaton, Chien-Pao, or Charizard ex) will give you a fully legal preconstructed deck that teaches you the ropes and helps you get a feel for playing the game