Cheapest priced copy (Forgotten Realms Commander): $3.49 at Card Kingdom, near mint, their price list as of .
Fevered Suspicion 
Sorcery · Rare · Forgotten Realms Commander · #316
Each opponent exiles cards from the top of their library until they exile a nonland card. You may cast any number of spells from among those nonland cards without paying their mana costs.
Rebound (If you cast this spell from your hand, exile it as it resolves. At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.)
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $3.49 to $3.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Forgotten Realms Commander | 47 | Rare | $3.49 | — |
| Forgotten Realms Commander | 316 | Rare | $3.99 | — |
5 rulings from Wizards of the Coast
- 23 July 2021Cards you don't cast this way, including any exiled land cards, will remain in exile indefinitely.
- 23 July 2021You cast the cards exiled with Fevered Suspicion as it is resolving. If you choose not to cast them, you cannot cast them later.
- 23 July 2021If the card has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
- 23 July 2021You may cast the exiled cards in any order, not just the order they were exiled.
- 23 July 2021If you cast a spell “without paying its mana cost,” you can't choose to cast it for any alternative costs. You can, however, pay additional costs. If the card has any mandatory additional costs, you must pay those to cast the spell.