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Try Infiltrator’s Magemark or Curiosity for blue cards with repeatable card draw when dealing combat damage. Curiosity is the closest effect—drawing a card when the equipped/enchanted creature deals damage. Both are in blue like Mystery Key.
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| Rarity: | Rare |
| Converted Cost: | 1 |
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| Layout: | Normal |
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| Rarity: | Uncommon |
| Converted Cost: | 2 |
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| Layout: | Normal |
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(: Attach to target creature you control. Equip only as a sorcery.) | Color: | |
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| Rarity: | Rare |
| Converted Cost: | 1 |
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| Layout: | Normal |
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| Rarity: | Uncommon |
| Converted Cost: | 2 |
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| Layout: | Normal |
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(: Attach to target creature you control. Equip only as a sorcery.) 
