Storm of Souls is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Return all creature cards from your graveyard to the battlefield. Each of them is a 1/1 Spirit with flying in addition to its other types. Exile Storm of Souls.

Complete guide

Storm of Souls is a powerful mass-resurrection spell that can instantly rebuild a depleted board state. By pulling every creature card from your graveyard back into the fray, it turns a defeat into a ghostly army ready for war. While your creatures return smaller, their newfound flight and Spirit typing provide unique tactical advantages.

What It Does

Storm of Souls returns every single creature card currently in your graveyard to the battlefield. Regardless of their original power and toughness, these creatures become 1/1 Spirits in addition to their existing types. They also gain the flying keyword, allowing them to soar over ground-based blockers.

How It Resolves

When Storm of Souls resolves, first identify all creature cards in your graveyard. All these cards enter the battlefield simultaneously. Any 'enters the battlefield' abilities will trigger at this time. Once the creatures are on the board, Storm of Souls is exiled rather than being put into the graveyard, preventing easy recursion of the spell itself.

Common Mistakes

A common point of confusion involves the base power and toughness. Even if a creature card has a characteristic-defining ability (like 'this creature's power is equal to the number of lands you control'), the 1/1 setting from Storm of Souls takes precedence because it is applied in a later layer. Additionally, remember that the creatures are still their original types, so a Dragon returned this way is a 1/1 Spirit Dragon.

When to Play It

This sorcery is best utilized after a mid-to-late game board wipe when your graveyard is full of utility creatures or cards with powerful 'enters the battlefield' effects. Since the creatures become 1/1s, you should focus on cards that provide value through abilities rather than raw stats.

Interaction examples

Recovery after a Board Wipe

Austere Command

If your opponent uses Austere Command to destroy all creatures with mana value 4 or greater, your large threats go to the graveyard. You can then cast Storm of Souls to bring all of them back. Even though they are now 1/1s, their abilities and high mana values remain, and they gain flying to bypass any remaining ground units.

Graveyard Timing

Farewell

It is vital to check the stack when facing Farewell. If your opponent chooses to 'Exile all graveyards', your creature cards will be gone before Storm of Souls can resolve. However, if you have already resolved Storm of Souls, your creatures are safely on the battlefield, though they would still be vulnerable if the opponent chose 'Exile all creatures' as part of the same spell.

Guide written with AI from the official text and rulings. Official English text prevails.