Cheapest priced copy (Commander Legends): $0.35 at Card Kingdom, near mint, their price list as of .
Aven Surveyor 
Creature — Bird Scout · 2/2 · Common · Fate Reforged · #31
Flying
When this creature enters, choose one —
• Put a +1/+1 counter on this creature.
• Return target creature to its owner's hand.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Legends | 57 | Common | $0.35 | $0.49 |
| Fate Reforged | 31 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 24 November 2014If a mode requires a target and there are no legal targets available, that mode can't be chosen. You must choose another mode if able.
- 24 November 2014You choose which mode you're using as you put the ability on the stack, after the creature has entered the battlefield. Once you've chosen a mode, you can't change that mode even if the creature leaves the battlefield in response to that ability.