Scylla and Charybdis

Scylla and Charybdis cannot be the target of enchant creature spells.
When Scylla and Charybdis enter the battlefield, destroy up to two target creatures.
{x}{x}{u}: Remove from play target permanent whose total converted mana cost is {x}. {x} cannot be {0}. Scylla and Charybdis deal 5 damage to you, return target permanent to play under its original owners control during the next upkeep.