Alania, Divergent Storm + Reverberate

Prerequisites

You have not cast an instant or sorcery spell this turn. You have a sorcery card in hand.

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 Reverberate by paying {R}{R}, targeting the additional sorcery.
4. Alania triggers, causing an opponent to draw a card and you to copy Reverberate, with the copy targeting the original Reverberate.
5. Resolve the copy of Reverberate, copying the original Reverberate, with the copy targeting the original Reverberate.
6. Repeat step 5.