Reverberations

When Reverberations enters the battlefield, you gain 5 life.
You may cast Instant and Sorcery spells from your graveyard and exile.
{w/u}{w/u}{2}: Cast 2 instant or sorcery spells from your graveyard or exile without paying its mana cost.
Delirium: You may instead cast 2 Instant and 2 Sorcery spells from your graveyard without paying their mana costs only if you have 4 or more card types in your graveyard.
Pay 5 life: Regenerate Reverberations.