Cheapest priced copy (Universes Within): $7.99 at Card Kingdom, near mint, their price list as of .
Mathise, Surge Channeler 
Legendary Creature — Human Elf Shaman Sorcerer · 1/1 · Rare · Universes Within · #25
Whenever you cast an instant or sorcery spell with mana value 3 or greater, roll a d20.
1-9 | Each player draws a card.
10-19 | You draw a card.
20 | Copy that spell. You may choose new targets for the copy.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $7.99 to $9.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Secret Lair Drop | 1238 | Rare | $9.49 | $9.99 |
| Universes Within | 25 | Rare | $7.99 | — |