Cheapest priced copy (Innistrad: Double Feature): $0.49 at Card Kingdom, near mint, their price list as of .
Winged Portent 
Instant · Rare · Innistrad: Crimson Vow · #89
Cleave {4}{G}{U} (You may cast this spell for its cleave cost. If you do, remove the words in square brackets.)
Draw a card for each creature you control [with flying].
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $0.49 to $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Innistrad: Double Feature | 356 | Rare | $0.49 | $1.49 |
| Innistrad: Crimson Vow Promos | 89p | Rare | $0.69 | $0.79 |
| Innistrad: Crimson Vow Promos | 89s | Rare | — | $1.29 |
| Innistrad: Crimson Vow | 89 | Rare | $0.49 | $0.49 |
| Innistrad: Crimson Vow | 365 | Rare | $0.49 | $0.79 |
4 rulings from Wizards of the Coast
- 19 November 2021If an effect allows you to “cast a spell without paying its mana cost,” you can't cast that spell for its cleave cost.
- 19 November 2021You can't cast a spell for both its cleave cost and another alternative cost. For example, if an effect gives an Alchemist's Retrieval in your graveyard a flashback cost of {U}, you can't cast it from your graveyard for its cleave cost.
- 19 November 2021If you cast a spell for its cleave cost, that spell doesn't have any of the text in square brackets while it's on the stack.
- 19 November 2021A cleave cost is an alternative cost that's paid instead of the spell's mana cost. Casting a spell for its cleave cost doesn't change the spell's mana value.