Cheapest priced copy (Jumpstart 2022): $0.39 at Card Kingdom, near mint, their price list as of .
Fallowsage 
Creature — Merfolk Wizard · 2/2 · Uncommon · Jumpstart 2022 · #297
Whenever this creature becomes tapped, you may draw a card.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $0.39 to $4.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Jumpstart 2022 | 297 | Uncommon | $0.39 | — |
| Lorwyn | 63 | Uncommon | $0.69 | $4.49 |
| March of the Machine Commander | 223 | Uncommon | $0.39 | — |
2 rulings from Wizards of the Coast
- 1 October 2007This is a triggered ability, not an activated ability. It doesn't allow you to tap the creature whenever you want; rather, you need some other way of tapping it, such as by attacking with the creature.
- 1 October 2007For the ability to trigger, the creature has to actually change from untapped to tapped. If an effect attempts to tap the creature, but it was already tapped at the time, this ability won't trigger.