Requires

Alania, Divergent Storm must be on the battlefield. Return the Favor must be in hand. You have not cast an instant or sorcery spell this turn. You have a sorcery card in hand. Mana needed: plus enough mana to cast the additional sorcery

Steps

1. Cast the additional sorcery by paying its mana cost.
2. Alania triggers; choose not to have an opponent draw a card.
3. Holding priority, cast Return the Favor by paying , targeting the additional sorcery.
4. Alania triggers, causing an opponent to draw a card and you to copy Return the Favor, with the copy targeting the original Return the Favor.
5. Resolve the copy of Return the Favor, copying the original Return the Favor, with the copy targeting the original Return the Favor.
6. Repeat step 5.

Results