With Ravnica: City of Guilds , Autochthon Wurm became the creature with the highest toughness at the time
If you clean the board a few times in a game, the board is going to be populated with smaller numbers of larger creatures, and making what sticks go away and getting some life out of it gives you more time to keep going on to your next big spell
Their iridescence is really great to look at (granted, for early EX, like @wisewailmer said, they really have to be pretty much mint to look really good)
Omniscience + Enter the Infinite + Laboratory Maniac and any other draw spell (of 2+ cards) for an instant win
Whenever a Colorless Pokmon is Knocked Out by damage from an opponent's Pokmon's attack, the opponent takes 1 fewer Prize card
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