Cheapest priced copy (Battlebond): $0.35 at Card Kingdom, near mint, their price list as of .
Combo Attack 
Sorcery · Common · Battlebond · #67
Two target creatures your team controls each deal damage equal to their power to target creature.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Battlebond | 67 | Common | $0.35 | $0.49 |
| The List | BBD-67 | Common | $0.35 | — |
One ruling from Wizards of the Coast
- 8 June 2018You can’t cast Combo Attack without targeting two creatures your team controls. If one of those creatures is an illegal target as Combo Attack resolves, the other will still deal damage equal to its power.