Cheapest priced copy (Adventures in the Forgotten Realms): $0.49 at Card Kingdom, near mint, their price list as of .
Minion of the Mighty 
Creature — Kobold · 0/1 · Rare · Adventures in the Forgotten Realms · #320
Menace
Pack tactics — Whenever this creature attacks, if you attacked with creatures with total power 6 or greater this combat, you may put a Dragon creature card from your hand onto the battlefield tapped and attacking.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
6 printings · $0.49 to $16.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Adventures in the Forgotten Realms | 156 | Rare | $0.69 | $0.79 |
| Adventures in the Forgotten Realms | 320 | Rare | $0.49 | $0.79 |
| Foundations Commander | 166 | Rare | $0.49 | — |
| Adventures in the Forgotten Realms Promos | 156a | Rare | — | $16.99 |
| Adventures in the Forgotten Realms Promos | 156p | Rare | $5.49 | $1.49 |
| Adventures in the Forgotten Realms Promos | 156s | Rare | — | $2.49 |
3 rulings from Wizards of the Coast
- 23 July 2021A Dragon creature card is a creature card with the creature type Dragon, not necessarily a creature card with the word “Dragon” in its name.
- 23 July 2021You choose which player or planeswalker the Dragon is attacking as you put it onto the battlefield. It doesn't have to be the same player or planeswalker Minion of the Mighty is attacking.
- 23 July 2021The creature card is already tapped and attacking as it's put onto the battlefield. Any abilities that trigger whenever a creature becomes tapped or whenever a creature attacks won't trigger.