Cheapest priced copy (Commander 2019): $0.35 at Card Kingdom, near mint, their price list as of .
Scaretiller 
Artifact Creature — Scarecrow · 1/4 · Common · Commander 2019 · #57
Whenever this creature becomes tapped, choose one —
• You may put a land card from your hand onto the battlefield tapped.
• Return target land card from your graveyard to the battlefield tapped.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
4 printings · $0.35 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2019 | 57 | Common | $0.35 | — |
| Commander Masters | 971 | Common | $0.35 | — |
| Outlaws of Thunder Junction Commander | 266 | Common | $0.35 | — |
| Zendikar Rising Commander | 117 | Common | $0.35 | — |
3 rulings from Wizards of the Coast
- 23 August 2019Scaretiller's ability is a triggered ability, not an activated ability. It doesn't allow you to tap it whenever you want; rather, you need some other way of tapping it, such as by attacking.
- 23 August 2019If Scaretiller becomes tapped while casting a spell or activating an ability, that spell or ability resolves after Scaretiller's triggered ability has resolved.
- 23 August 2019Neither mode of Scaretiller's ability counts as playing a land. It can put a land card onto the battlefield even if you've already played your land for the turn, and even if it's not your turn.