Cheapest priced copy (The List): $1.49 at Card Kingdom, near mint, their price list as of .
Ruin Crab 
Creature — Crab · 0/3 · Uncommon · Zendikar Rising · #75
Landfall — Whenever a land you control enters, each opponent mills three cards. (To mill a card, a player puts the top card of their library into their graveyard.)
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $1.49 to $7.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The List | ZNR-75 | Uncommon | $1.49 | — |
| Media and Collaboration Promos | 2023-4 | Rare | — | — |
| Secret Lair Drop (Mirelurk Hatchling) | 7095 | Rare | $7.49 | $5.99 |
| Zendikar Rising | 75 | Uncommon | $1.49 | $1.99 |
| Zendikar Rising | 295 | Uncommon | $1.79 | $1.99 |
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 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 2024A landfall ability doesn't trigger if a permanent already on the battlefield becomes a land.