Bladewing the Risen + Moritte of the Frost

Prerequisites

You have enough mana to cast Moritte of the Frost

Steps

1. Cast Moritte of the Frost by paying its mana cost, choosing to have it enter the battlefield as a copy of Bladewing.
2. Put Bladewing into your graveyard due to the legend rule.
3. Moritte of the Frost's enter-the-battlefield ability triggers, returning Bladewing from your graveyard to the battlefield.
4. Put Bladewing into your graveyard due to the legend rule.
5. Bladewing's enter-the-battlefield ability triggers, returning it from your graveyard to the battlefield.
6. Repeat from step 4.