Cheapest priced copy (Planar Chaos): $0.49 at Card Kingdom, near mint, their price list as of .
Phantasmagorian 
Creature — Horror · 6/6 · Uncommon · Planar Chaos · #77
When you cast this spell, any player may discard three cards. If a player does, counter Phantasmagorian.
Discard three cards: Return this card from your graveyard to your hand.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.49 to $14.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Planar Chaos | 77 | Uncommon | $0.49 | $14.99 |
3 rulings from Wizards of the Coast
- 1 February 2007When this spell is cast, its "when you cast" ability triggers and goes on the stack on top of it.
- 1 February 2007As the triggered ability resolves, the active player gets the option to perform the action. If that player declines, the next player in turn order gets the option. As soon as any player performs the action, the spell is countered, but the remaining players still get the option. If all players decline, the spell remains on the stack.
- 1 July 2013A player can't choose to discard unless they actually have three cards in their hand.