However, there are decks of him that don't use extras, so you shouldn't put them in your main deck
Magic: The Gathering Comprehensive Rules, 702.4
If the opponent untaps with this creature on the battlefield, they generate tons of mana and often pull away with the game
In addition, collectors often use the so-called light test, which involves holding the card against a light source to inspect the inner material layer
This is nice as it gives you the best chances for that turn and may even help you win, but you would not want your opponent to have this card in their deck
You can also play with 5 people and 1 deck, only deal 2 cards in front of each player