Nathalya, Damned Blessing

When Nathalya enters the battlefield, create four
1/1 white and black Aether Dagger artifact
creatures with flying and with: "{t} Sacrifice this
creature: Aether Dagger deals 1 damage to
any target"
At the beginning of your upkeep, you may pay
1 life to create a 1/1 white and black Aether
Dagger artifact creature with flying and with:
"{t} Sacrifice this creature: Aether Dagger deals
1 damage to any target"