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This effect isn't attached to a creature like Harsh Mentor, which actually makes it less likely to be taken out by removal

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Multiple instances of bloodthirst are cumulative

Otherwise, it seems like the idea was to give each deck at least one additional "good" artifact, ranging from Lightning Greaves to Skullclamp to new cards like Manascape Refractor

The other three cards were part of a futureshifted vertical cycle