Five-Headed Dragon
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Its more or less personal opinion.
The strongest spellcaster yugioh card is obviously Relinquished and Thousand-Eyes Restrict, they can take the attack of any monster card so it could even be thought as the strongest monster. Thousand-Eyes Restrict is so powerful that it was banned in the year of 2006.
Nothing, unless the card specifically mentions a penalty for not attacking. If a monster is in defense mode it is not able to declare an attack, and there are no consequences for not attacking unless the monster's text mentions one.
all of the exodia peicess put together
Cards with "Alien" in their card name deal with A-Counters. There is no such thing as an "A-Counter monster".