Because the effect makes it a "D" pokemon in a sence. "D" pokemon could then be turned back into there original type, destroying the whole point. It basiclly makes a pokemon delta for a turn.
When you play this card,Flip a coin.If heads,search for a basic Pokemon,show it to your opponent,and
put it into your bench.If your hand has at least 5 cards,discard 2 cards from your hand and draw 1 card
from your deck.
icemaster
Name: Good. But the name is a bit missleading, as that would be a stadium. 1 point.
Card: The effect is good enough, but you had several grammer errors, such as "search for a basic Pokemon", and "put it into your bench". 16 points.
Total: 17
This card provides ( C ) Energy. When you attach this card to your active Pokémon, you may discard one Energy Card attached to one of your Pokémon, (except Swap Energy) and draw a card, or you may choose a card from your hand, and shuffle it into your deck and draw a card.
This card stays in play when you play it. Discard this card if another stadium comes into play. If another stadium with the same name is already in play, you can't play this card.
When your opponent draws a prize card(s) you may discard 1 card from your hand. If you do, draw a number of cards equal to the number of your opponent's remaining prize cards.
Fire Meowth. He had the secret word in his card, discard. The other word was Berry. MOT6K came in second, with Icemaster trailing in third, and ExDragon18 left behind.