13 damage to one of your creatures? Actually...

Indestructible As this creature enters, choose a player. Whenever this creature is dealt damage, it deals that much damage to the chosen player. : This creature deals 1 damage to itself.

Shivan Meteor deals 13 damage to target creature. Suspend 2— (Rather than cast this card from your hand, you may pay and exile it with two time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost.)

If a source would deal damage to a permanent or player, it deals double that damage to that permanent or player instead.

When Wort enters, create two 1/1 red and green Goblin Warrior creature tokens. Each red or green instant or sorcery spell you cast has conspire. (As you cast the spell, you may tap two untapped creatures you control that share a color with it. When you do, copy it and you may choose new targets for the copy.)