It gets out of hand very, very quickly
Fluctuator is very narrow, only really functioning in a cycling focused deck, but its one of the most powerful pieces for that strategy and makes most of the landcycling costs free
With Miriam looking like the only answer, I totally think this card is deserving of its number 10 spot on this list
The Poncho Pikachus are not only iconic because they're expensive, but because they come from a time where the Hobby was far from what it is today
Abilities like Reckless however, dont specify that you have to challenge a character to benefit from it, so a Reckless character could choose to challenge a location instead - or may be forced to
2010-08-15 The last ability will cause you to lose the game even if you somehow manage to have a life total greater than 0 at the time the Lich leaves the battlefield or if some other effect would prevent you from losing for having 0 life