Cheapest priced copy (Modern Masters 2017): $0.35 at Card Kingdom, near mint, their price list as of .
Mystic Genesis 
Instant · Rare · Gatecrash · #180
Counter target spell. Create an X/X green Ooze creature token, where X is that spell's mana value.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Gatecrash | 180 | Rare | $0.49 | $0.49 |
| Modern Masters 2017 | 174 | Uncommon | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 14 March 2017You may target a spell that can’t be countered. When Mystic Genesis resolves, the target spell will be unaffected, but you’ll still get an Ooze token.
- 14 March 2017If the target spell is an illegal target when Mystic Genesis tries to resolve, Mystic Genesis won’t resolve and none of its effects will happen. You won’t get an Ooze token.