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Equivalent cards to Four Knocks (assuming you mean cards with similar Clue or investigating mechanics in white) include:
Reason: These white cards create Clues or investigate, similar to Four Knocks.
| Color: |  |
| Identifies: | |
| Cost: |
 |
| Rarity: | Rare |
| Converted Cost: | 3 |
| Power/Toughness: | / |
| Types: | |
| SubTypes: | |
| Languages: | 
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| Layout: | Normal |
| Rank: | |
| Saltiness: |
| Color: | |
| Identifies: | |
| Cost: |
|
| Rarity: | Rare |
| Converted Cost: | 3 |
| Power/Toughness: | / |
| Types: | |
| SubTypes: | |
| Languages: |
|
| Layout: | Normal |
| Rank: | |
| Saltiness: |
