Cheapest priced copy (Modern Masters 2017): $0.99 at Card Kingdom, near mint, their price list as of .
Tandem Lookout 
Creature — Human Scout · 2/1 · Uncommon · Avacyn Restored · #80
Soulbond (You may pair this creature with another unpaired creature when either enters. They remain paired for as long as you control both of them.)
As long as Tandem Lookout is paired with another creature, each of those creatures has "Whenever this creature deals damage to an opponent, draw a card."
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
4 printings · $0.99 to $34.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Avacyn Restored | 80 | Uncommon | $1.29 | $34.99 |
| Duel Decks: Blessed vs. Cursed | 29 | Uncommon | $1.79 | — |
| Modern Masters 2017 | 53 | Common | $0.99 | $10.99 |
| The List | MM3-53 | Common | $1.49 | — |
One ruling from Wizards of the Coast
- 14 March 2017If Tandem Lookout or the creature it’s paired with is dealt lethal damage at the same time that either deals damage to an opponent, its ability triggers. You’ll draw a card even though that creature no longer has the ability.