Cheapest priced copy (Dragons of Tarkir): $0.49 at Card Kingdom, near mint, their price list as of .
Foe-Razer Regent 
Creature — Dragon · 4/5 · Rare · Dragons of Tarkir · #187
Flying
When this creature enters, you may have it fight target creature you don't control.
Whenever a creature you control fights, put two +1/+1 counters on it at the beginning of the next end step.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $0.49 to $2.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Dragons of Tarkir | 187 | Rare | $0.49 | $0.79 |
| Dragons of Tarkir Promos | 187s | Rare | — | $1.29 |
| Tarkir Dragonfury | 187 | Rare | $2.49 | — |
| Starter Commander Decks | 183 | Rare | $0.49 | — |
3 rulings from Wizards of the Coast
- 25 February 2015If the target creature you don’t control becomes an illegal target of the first triggered ability before it resolves, Foe-Razer Regent won’t fight and its last ability won’t trigger.
- 25 February 2015You choose the target of the first triggered ability as it goes on the stack, but you choose whether or not to fight as that ability resolves.
- 25 February 2015If a creature you control fights during an end step, the delayed triggered ability that puts +1/+1 counters on that creature won’t trigger until the beginning of the following turn’s end step.