Cheapest priced copy (Game Night): $0.35 at Card Kingdom, near mint, their price list as of .
Seismic Elemental 
Creature — Elemental · 4/4 · Uncommon · Magic Origins · #161
When this creature enters, creatures without flying can't block this turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Game Night | 41 | Uncommon | $0.35 | — |
| Jumpstart | 362 | Uncommon | $0.35 | — |
| Magic Origins | 161 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 22 June 2015No creature without flying will be able to block that turn, including creatures that lose flying after Seismic Elemental’s ability resolves and creatures without flying that enter the battlefield after that ability resolves.