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As an additional cost to cast this spell, you may tap any number of untapped creatures you control. This spell costs {1} less to cast for each creature tapped this way.
Explosive Singularity deals 10 damage to any target.
Explosive Singularity's additional cost can't reduce its cost below {R}{R}. You can tap any number of untapped creatures, however, even if they won't reduce the cost further.
