Cheapest priced copy (Gatecrash): $0.79 at Card Kingdom, near mint, their price list as of .
Boros Reckoner 
Creature — Minotaur Wizard · 3/3 · Rare · Gatecrash · #215
Whenever this creature is dealt damage, it deals that much damage to any target.
{R/W}: This creature gains first strike until end of turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $0.79 to $3.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| GRN Guild Kit | 85 | Rare | $0.99 | — |
| Gatecrash | 215 | Rare | $0.79 | $3.49 |
| Murders at Karlov Manor Commander | 201 | Rare | $0.79 | — |
| Modern Masters 2017 | 206 | Rare | $0.99 | $3.99 |
| The List | GK1-85 | Rare | $0.79 | — |
3 rulings from Wizards of the Coast
- 14 March 2017Boros Reckoner's first ability will trigger even if it is dealt lethal damage. For example, if it blocks a 7/7 creature, its ability will trigger and Boros Reckoner will deal 7 damage to the target.
- 14 March 2017If Boros Reckoner is dealt damage by multiple sources at once, such as by two creatures blocking it, its ability triggers once and one target is dealt that much damage.
- 14 March 2017Damage dealt by Boros Reckoner due to its first ability isn't combat damage, even if it was combat damage that caused that ability to trigger.