You can activate Seal of Primordiumâ€™s ability targeting Seal of Primordium itself if you want it to leave the battlefield. This is because targets are chosen before costs are paid. The ability wonâ€™t resolve as it tries to resolve.
This is the timeshifted version of Seal of Cleansing.
This is not modal. If the target changes from an artifact to an enchantment or vice versa, this still destroys it.
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