Cheapest priced copy (Kaldheim): $2.29 at Card Kingdom, near mint, their price list as of .
Pyre of Heroes 
Artifact · Rare · Kaldheim · #241
{2}, {T}, Sacrifice a creature: Search your library for a creature card that shares a creature type with the sacrificed creature and has mana value equal to 1 plus that creature's mana value. Put that card onto the battlefield, then shuffle. Activate only as a sorcery.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $2.29 to $7.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Kaldheim | 241 | Rare | $2.29 | $2.99 |
| Kaldheim | 370 | Rare | $4.49 | $3.99 |
| Kaldheim Promos | 241p | Rare | $6.49 | $7.99 |
| Kaldheim Promos | 241s | Rare | — | $4.49 |
3 rulings from Wizards of the Coast
- 5 February 2021Once you announce that you're activating the activated ability, no player may take actions until the ability has been paid for. Notably, opponents can't try to remove one of your creatures to stop you from sacrificing it.
- 5 February 2021Use the creature types and mana value of the creature you sacrificed as it existed on the battlefield to determine what creature card you can find. Notably, if you sacrifice a creature that's a double-faced permanent with its back face up, you'll use the characteristics of the back face, not the front face.
- 5 February 2021If a permanent or a card in a library has {X} in its mana cost, X is considered to be 0.