Only the winners of the lottery were given the opportunity to purchase the gold Pikachu card for a whopping 216,000 (about $2,081)
Successful blink decks have existed in Modern before, thanks largely to Soulherder
Water - Psychic/Effect 0/0 If this card is in your Graveyard and you control 1 or more continuous "Cubic" Spell/Traps card: You can banish this card from your Graveyard, then target 1 "Cubic" monster in your Graveyard
And here comes the collecting: Gotta cathem all
The most likely reasons are if it's sacrificed, if it's legendary and another legendary permanent with the same name is controlled by the same player, if it's a planeswalker and another planeswalker with the same subtype is controlled by the same player, if it's a creature with toughness 0 or less, or if it's an Aura that's either unattached or attached to something illegal
Some of the comments on TCGPlayer help to explain the price