Its hard to discount any deck with a 3000 ATK creature like Lady Labrynth of the Silver Castle, which can not only easily Special summon itself from the hand but remain untouchable by card effects provided you control a set spell or trap card - never mind one that main deck many of the cards necessary to counter the top strategies of the day
Just like everyone else, I thought the ability would be some kind of drawback when I first read the card, but no, its just a creature that synergizes perfectly with what Golgari and Dimir are trying to do in the set
The biggest, baddest creature in the red lexicon must be Akroma, Angle of Fury
However, if Dragon-type cards are taken into consideration, it is quite good actually
One would be an expansion of Solo Mode that allows players to face a selection of AI duelists similar to Duel Links
The evolution line's powerful Fire-type attacks and dragon-like final form make Charmander a cherished and memorable Pokmon, capturing the hearts of trainers worldwide