Cheapest priced copy (Doctor Who): $1.29 at Card Kingdom, near mint, their price list as of .
Four Knocks 
Enchantment · Rare · Doctor Who · #20
Vanishing 4 (This enchantment enters with four time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)
At the beginning of your first main phase, draw a card.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
4 printings · $1.29 to $1.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Doctor Who | 20 | Rare | $1.29 | $1.49 |
| Doctor Who | 340 | Rare | $1.49 | $1.99 |
| Doctor Who | 625 | Rare | — | $1.99 |
| Doctor Who | 931 | Rare | — | $1.99 |