Cheapest priced copy (Commander Masters): $0.49 at Card Kingdom, near mint, their price list as of .
Sandwurm Convergence 
Enchantment · Rare · Amonkhet · #183
Creatures with flying can't attack you or planeswalkers you control.
At the beginning of your end step, create a 5/5 green Wurm creature token.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
6 printings · $0.49 to $6.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Amonkhet | 183 | Rare | $0.69 | $4.49 |
| Commander Legends: Battle for Baldur's Gate | 833 | Rare | $0.69 | — |
| Commander Masters | 911 | Rare | $0.49 | — |
| Duskmourn: House of Horror Commander | 195 | Rare | $0.49 | — |
| New Capenna Commander | 308 | Rare | $0.49 | — |
| Amonkhet Promos | 183s | Rare | — | $6.99 |
One ruling from Wizards of the Coast
- 18 April 2017Once a creature has attacked you or a planeswalker you control, it will remain in combat even if it gains flying. Similarly, if a creature with flying enters the battlefield attacking, Sandwurm Convergence's first ability can't undo that attack.