Necromancy enters the battlefield, triggering itself, Kodama, and Cloudstone Curio.
Resolve the Necromancy trigger, returning a nonartifact enchantment creature with mana value two or greater from your graveyard to the battlefield and attaching Necromancy to it.
The enchantment creature enters the battlefield, triggering Kodama and Cloudstone Curio.
Resolve the Cloudstone Curio trigger from the enchantment creature, returning Necromancy from the battlefield to your hand.
Necromancy leaves the battlefield, causing you to sacrifice the creature it was attached to.
Resolve the Kodama trigger from the enchantment creature, putting Necromancy from your hand onto the battlefield.
Necromancy enters the battlefield, triggering itself and Cloudstone Curio.