There isn’t an official Magic: The Gathering card called Cecil, Dark Knight. If you mean a card with similar flavor—such as a black knight that represents corruption or redemption—try these:
Reason: All are black knights with strong thematic connections.
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| Rarity: | Rare |
| Converted Cost: | 1 |
| Power/Toughness: | 1/2 |
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| Layout: | Normal |
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| Rarity: | Common |
| Converted Cost: | 2 |
| Power/Toughness: | 2/1 |
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| Layout: | Normal |
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| Rarity: | Rare |
| Converted Cost: | 3 |
| Power/Toughness: | 2/2 |
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| Layout: | Normal |
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