Cheapest priced copy (Commander Masters): $0.35 at Card Kingdom, near mint, their price list as of .
Khalni Heart Expedition 
Enchantment · Common · Zendikar · #167
Landfall — Whenever a land you control enters, you may put a quest counter on this enchantment.
Remove three quest counters from this enchantment and sacrifice it: Search your library for up to two basic land cards, put them onto the battlefield tapped, then shuffle.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
9 printings · $0.35 to $6.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2018 | 154 | Common | $0.39 | — |
| Commander Masters | 899 | Common | $0.35 | — |
| Commander Legends | 428 | Common | $0.35 | — |
| Duel Decks: Zendikar vs. Eldrazi | 18 | Common | $0.39 | — |
| Archenemy: Nicol Bolas | 67 | Common | $0.39 | — |
| Jumpstart 2022 | 90 | Common | $0.49 | — |
| The List | C18-154 | Common | $0.35 | — |
| Zendikar | 167 | Common | $0.39 | $6.99 |
| Zendikar Rising Commander | 72 | Common | $0.35 | — |
3 rulings from Wizards of the Coast
- 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.
- 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.