Cheapest priced copy (Throne of Eldraine): $10.99 at Card Kingdom, near mint, their price list as of .
Embercleave 
Legendary Artifact — Equipment · Mythic · Throne of Eldraine · #359
Flash
This spell costs {1} less to cast for each attacking creature you control.
When Embercleave enters, attach it to target creature you control.
Equipped creature gets +1/+1 and has double strike and trample.
Equip {3}
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
6 printings · $10.99 to $39.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Throne of Eldraine | 120 | Mythic | $10.99 | $19.99 |
| Throne of Eldraine | 359 | Mythic | $22.99 | $39.99 |
| Throne of Eldraine Promos | 120p | Mythic | $12.99 | $22.99 |
| Throne of Eldraine Promos | 120s | Mythic | — | $23.99 |
| The List | ELD-120 | Mythic | $11.99 | — |
| Special Guests | 77 | Mythic | $21.99 | $37.99 |
3 rulings from Wizards of the Coast
- 8 November 2024Once you announce that you're casting a spell, no player may take actions until the spell has been paid for. Notably, opponents can't try to increase Embercleave's cost by removing attacking creatures you control.
- 8 November 2024Embercleave's second ability can't reduce its cost below {R}{R}.
- 8 November 2024To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions. The mana value of the spell remains unchanged, no matter what the total cost to cast it was.