is For Helm of Obedience the Oracle text reads: "Target opponent puts cards from the top of his or her library into his or her graveyard until a creature card or X cards are put into that graveyard this way, whichever comes first." However, Leyline of the Void states that, "If a card would be put into an opponent's graveyard from anywhere, exile it instead." Because the cards are being exiled and not going to the Graveyard the 'stop' condition in the Helm's text is never met and so you only stop putting cards from the top off your opponent's library into exile when you run out of cards
If theyre exiled or killed, theyll return as normal lands
Since then, it's been climbing back, settling in the $160$210 range where it sits today
The second anime that was released, which fans are more familiar with, was called Yu-Gi-Oh
Dont worry about complexity
#3: Evolving Skies Again, not much to say