Cheapest priced copy (Ikoria: Lair of Behemoths): $0.49 at Card Kingdom, near mint, their price list as of .
Mythos of Brokkos 
Sorcery · Rare · Ikoria: Lair of Behemoths · #329
If {U}{B} was spent to cast this spell, search your library for a card, put that card into your graveyard, then shuffle.
Return up to two permanent cards from your graveyard to your hand.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $0.49 to $2.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ikoria: Lair of Behemoths | 168 | Rare | $0.49 | $0.49 |
| Ikoria: Lair of Behemoths | 329 | Rare | $0.99 | $2.99 |
| Ikoria: Lair of Behemoths Promos | 168p | Rare | $0.49 | $0.99 |
| Ikoria: Lair of Behemoths Promos | 168s | Rare | — | $1.29 |
6 rulings from Wizards of the Coast
- 17 April 2020Because Mythos of Brokkos doesn’t target the permanent cards in your graveyard, you may choose the card you searched for.
- 17 April 2020If an effect copies the Mythos spell, no mana was spent to cast the copy, so the copy won’t receive the bonus.
- 17 April 2020A permanent card is an artifact, creature, enchantment, land, or planeswalker card.
- 17 April 2020The ability checks what mana was actually spent to cast a spell. If an effect allows you to spend mana “as though it were mana” of any color or type, that allows you to spend mana you couldn’t otherwise spend, but it doesn’t change what mana you spent to cast the spell.
- 17 April 2020The abilities of the Mythos check what colors of mana were spent to cast the spell. It’s not an alternative cost to cast the spell.
- 17 April 2020If an effect allows you to cast a spell without paying its mana cost, you can’t choose to cast it and pay unless another rule or effect allows you to cast that spell for a cost. Similarly, you can’t waive a cost reduction unless that effect says you may.