Cheapest priced copy (The List): $0.35 at Card Kingdom, near mint, their price list as of .
Canyon Jerboa 
Creature — Mouse · 1/2 · Uncommon · Zendikar Rising · #7
Landfall — Whenever a land you control enters, creatures you control get +1/+1 until end of turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The List | ZNR-290 | Uncommon | $0.35 | — |
| Zendikar Rising | 7 | Uncommon | $0.35 | $0.49 |
| Zendikar Rising | 290 | Uncommon | $0.35 | $0.49 |
4 rulings from Wizards of the Coast
- 25 September 2020Canyon Jerboa's ability affects only creatures you control at the time it resolves. Creatures you begin to control later in the turn won't get +1/+1.
- 8 November 2024A landfall ability triggers whenever a land you control enters for any reason. It triggers whenever you play a land, as well as whenever a spell or ability puts a land onto the battlefield under your control.
- 8 November 2024Whenever a land you control enters, each landfall ability of the permanents you control will trigger. You can put them on the stack in any order. The last ability you put on the stack will be the first one to resolve (As a result, you can have those abilities resolve in the order of your choosing.).
- 8 November 2024A landfall ability doesn't trigger if a permanent already on the battlefield becomes a land.