Containment Construct + Skirge Familiar + Cloudstone Curio + Blessed Sanctuary

Containment Construct

Skirge Familiar

Cloudstone Curio

Blessed Sanctuary

How it works

1. Activate Skirge Familiar by discarding a creature card with mana value one or less that can be cast using black mana, adding .
2. Containment Construct triggers, causing you to exile the creature card from your graveyard and allowing you to cast it from exile this turn.
3. Cast the creature card from exile by paying its mana cost.
4. The creature enters the battlefield, triggering Cloudstone Curio and Blessed Sanctuary.
5. Resolve the Cloudstone Curio trigger, choosing not to return anything to your hand from the battlefield.
6. Resolve the Blessed Sanctuary trigger, creating a 2/2 Unicorn creature token.
7. Cloudstone Curio triggers, returning the creature with mana value one or less from the battlefield to your hand.
8. Repeat.