Cheapest priced copy (Foundations Jumpstart): $0.59 at Card Kingdom, near mint, their price list as of .
Groundswell 
Instant · Common · Worldwake · #104
Target creature gets +2/+2 until end of turn.
Landfall — If you had a land enter the battlefield under your control this turn, that creature gets +4/+4 until end of turn instead.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
5 printings · $0.59 to $3.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Zendikar vs. Eldrazi | 15 | Common | $0.79 | — |
| Jumpstart 2022 | 669 | Common | $0.79 | — |
| Foundations Jumpstart | 667 | Common | $0.59 | — |
| The List | DDP-15 | Common | $0.69 | — |
| Worldwake | 104 | Common | $0.79 | $3.49 |
5 rulings from Wizards of the Coast
- 8 November 2024Whether you had a land enter the battlefield under your control this turn is checked as this spell resolves, not as you cast it.
- 8 November 2024The landfall ability checks for an action that has happened in the past. It doesn't matter if a land that entered the battlefield under your control previously in the turn is still on the battlefield, is still under your control, or is still a land.
- 8 November 2024The effect of this spell's landfall ability replaces its normal effect. If you had a land enter under your control this turn, only the landfall-based effect happens.
- 8 November 2024Once the spell resolves, having a land enter under your control provides no further benefit.
- 8 November 2024Having more than one land enter the battlefield under your control this turn provides no additional benefit.