Bladewing the Risen + Saw in Half

Steps

1. Cast Saw in Half by paying {2}{B}, destroying Bladewing and creating two token copies of it with base power equal to half the destroyed creature's power and base toughness equal to half the destroyed creature's toughness, rounding up each time.
2. Put one of the Bladewing tokens into your graveyard from the battlefield due to the legend rule.
3. The Bladewing tokens' enter-the-battlefield abilities trigger.
4. Resolve the first trigger, returning Bladewing from your graveyard to the battlefield.
5. Put Bladewing into your graveyard from the battlefield due to the legend rule.
6. Bladewing enter-the-battlefield ability triggers, returning it from your graveyard to the battlefield.
7. Repeat from step 5.