Cheapest priced copy (Commander Legends): $14.99 at Card Kingdom, near mint, their price list as of .
Blazing Sunsteel 
Artifact — Equipment · Rare · Commander Legends · #364
Equipped creature gets +1/+0 for each opponent you have.
Whenever equipped creature is dealt damage, it deals that much damage to any target.
Equip {4}
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $14.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Legends | 364 | Rare | $14.99 | — |
4 rulings from Wizards of the Coast
- 10 November 2020A creature can be dealt an amount of damage greater than its toughness. For example, if the equipped creature has 1 toughness and is dealt 3 damage, it deals 3 damage, not 1, to the chosen target.
- 10 November 2020If your life total is brought to 0 or less at the same time that the equipped creature is dealt damage, you lose the game before Blazing Sunsteel's middle ability goes on the stack.
- 10 November 2020Blazing Sunsteel is the source of the middle triggered ability, but the equipped creature is the source of the damage. For example, if the equipped creature is green, that ability can't target a permanent with protection from red, but it can target one with protection from green, though the damage would be prevented.
- 10 November 2020Opponents who have left the game aren't counted by Blazing Sunsteel's first ability.