Read rules for Mana Echoes
Whenever a creature enters, you may add an amount of 
equal to the number of creatures you control that share a creature type with it.
equal to the number of creatures you control that share a creature type with it.
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, Sacrifice a creature: This artifact deals 1 damage to any target.
Whenever a creature enters, you may untap this artifact.
, Sacrifice this artifact: Create X 1/1 green Snake creature tokens. Activate only as a sorcery.
