In a format dominated by fetch lands and tutors, its much harder to stop searching libraries than it is to stop drawing cards, and as such most people will seldom play around a resolved Archivist of Oghma
"Commander ninjutsu [cost]" means "[Cost], Reveal this card from your hand or from the command zone, Return an unblocked attacking creature you control to its owner's hand: Put this card onto the battlefield tapped and attacking." Commander ninjutsu is a variant of ninjutsu that can be activated from the command zone as well as from your hand
Creatures with the changeling ability, for example, can't be a second commander this way
Most countries sent their top four players of the tournament as representatives, though nations with minor Magic playing communities would sometimes only send one player
Card types such as artifact can't be chosen
Technically, this will be a slow death over time, halving an opponents life total with each hit