Soul Stone

Soul Stone is invincible.
When Soul Stone enters the battlefield sacrafice a creature.
If equipped creature kills another creature, add 1 mana of any kind to your mana pool.
{7}: Destroy target creature and create a copy of creature you destroyed and put it under your control.
{6}: Equip target creature, creature has hexproof.
{10}: Exile target creature, creature cannot be recovered from exile.