Cheapest priced copy (Lorwyn Eclipsed Commander): $0.99 at Card Kingdom, near mint, their price list as of .
Omnath, Locus of the Roil 
Legendary Creature — Elemental · 3/3 · Mythic · Lorwyn Eclipsed Commander · #130
When Omnath enters, it deals damage to any target equal to the number of Elementals you control.
Landfall — Whenever a land you control enters, put a +1/+1 counter on target Elemental you control. If you control eight or more lands, draw a card.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $0.99 to $24.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Lorwyn Eclipsed Commander | 130 | Mythic | $0.99 | — |
| Core Set 2020 | 216 | Mythic | $1.29 | $24.99 |
| Core Set 2020 Promos | 216p | Mythic | $4.49 | $14.99 |
| Core Set 2020 Promos | 216s | Mythic | — | $23.99 |
3 rulings from Wizards of the Coast
- 12 July 2019If the target Elemental is an illegal target by the time Omnath's second ability tries to resolve, the ability doesn't resolve. You don't draw a card if you control eight or more lands. If the target is legal but can't have a +1/+1 counter put on it (most likely because an opponent controls Blightbeetle), you do draw a card if you control eight or more lands.
- 12 July 2019You may choose Omnath as the target of its own second ability.
- 12 July 2019The number of Elementals you control is counted as Omnath's first ability resolves. If Omnath is still on the battlefield, it will count itself.