Cheapest priced copy (Duskmourn: House of Horror): $0.49 at Card Kingdom, near mint, their price list as of .
Winter, Misanthropic Guide 
Legendary Creature — Human Warlock · 3/4 · Rare · Duskmourn: House of Horror · #365
Ward {2}
At the beginning of your upkeep, each player draws two cards.
Delirium — As long as there are four or more card types among cards in your graveyard, each opponent's maximum hand size is equal to seven minus the number of those card types.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
4 printings · $0.49 to $1.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duskmourn: House of Horror | 240 | Rare | $0.49 | $0.49 |
| Duskmourn: House of Horror | 365 | Rare | $0.49 | $1.49 |
| Duskmourn: House of Horror Promos | 240p | Rare | $0.49 | $0.49 |
| Duskmourn: House of Horror Promos | 240s | Rare | — | $1.99 |
2 rulings from Wizards of the Coast
- 20 September 2024A player's maximum hand size is checked only during the cleanup step of their turn. At other times, they may have more cards in hand than their maximum hand size.
- 20 September 2024If multiple effects modify a player's hand size, apply them in timestamp order. For example, if you put Winter onto the battlefield and then your opponent plays Reliquary Tower (a land with "You have no maximum hand size"), that opponent would have no maximum hand size no matter when you started having delirium. However, if the permanents entered in the opposite order, that opponent's maximum hand size would be seven minus the number of card types among cards in your graveyard if you had delirium. At any time you didn't have delirium, they would have no maximum hand size.