Cheapest priced copy (Innistrad Remastered): $0.35 at Card Kingdom, near mint, their price list as of .
Seize the Storm 
Sorcery · Common · Innistrad Remastered · #401
Create a red Elemental creature token with trample and "This token's power and toughness are each equal to the number of instant and sorcery cards in your graveyard plus the number of cards with flashback you own in exile."
Flashback {6}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
5 printings · $0.35 to $3.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Innistrad: Double Feature | 158 | Uncommon | $0.59 | $3.49Out of stock |
| Innistrad Remastered | 170 | Common | $0.35 | $0.49 |
| Innistrad Remastered | 401 | Common | $0.99 | $0.49 |
| Jumpstart 2022 | 598 | Uncommon | $0.35 | — |
| Innistrad: Midnight Hunt | 158 | Uncommon | $0.35 | $0.49 |
9 rulings from Wizards of the Coast
- 24 September 2021If you cast Seize the Storm with no instant or sorcery cards in your graveyard and no cards with flashback in exile, the Elemental will start as a 0/0 creature. However, state-based actions won't be checked until after Seize the Storm has finished resolving. The Elemental will then be a 1/1 creature and survive because Seize the Storm will either be in your graveyard or in exile.
- 24 September 2021While a spell is on the stack, it is neither in your graveyard nor in exile, so it won't contribute to the Elemental's power and toughness. For example, with Seize the Storm in your graveyard and no cards in exile, the 1/1 Elemental in the above scenario will become 0/0 and die if you cast Seize the Storm from your graveyard using flashback.
- 24 September 2021The power and toughness of the Elemental token will change as the number of instant and sorcery cards in your graveyard and the number of cards with flashback you own in exile change.
- 6 June 2025"Flashback [cost]" means "You may cast this card from your graveyard if the resulting spell is an instant or sorcery spell by paying [cost] rather than paying its mana cost" and "If the flashback cost was paid, exile this card instead of putting it anywhere else any time it would leave the stack."
- 6 June 2025To determine the total cost of a spell, start with the mana cost or alternative cost (such as a flashback cost) you're paying, add any cost increases, then apply any cost reductions. The mana value of the spell is determined only by its mana cost, no matter what the total cost to cast the spell was.
- 6 June 2025You can cast a spell using flashback even if it was somehow put into your graveyard without having been cast.
- 6 June 2025You must still follow any timing restrictions and permissions, including those based on the card's type. For instance, you can cast a sorcery using flashback only when you could normally cast a sorcery.
- 6 June 2025A spell cast using flashback will always be exiled afterward, whether it resolves, is countered, or leaves the stack in some other way.
- 6 June 2025If a card with flashback is put into your graveyard during your turn, you can cast it if it's legal to do so before any other player can take any actions.