Cheapest priced copy (Guilds of Ravnica): $0.49 at Card Kingdom, near mint, their price list as of .
Firemind's Research 
Enchantment · Rare · Guilds of Ravnica · #171
Whenever you cast an instant or sorcery spell, put a charge counter on this enchantment.
{1}{U}, Remove two charge counters from this enchantment: Draw a card.
{1}{R}, Remove five charge counters from this enchantment: It deals 5 damage to any target.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Guilds of Ravnica | 171 | Rare | $0.49 | $0.49 |
| Guilds of Ravnica Promos | 171 | Rare | — | $0.49 |
| Guilds of Ravnica Promos | 171s | Rare | — | $0.49 |
One ruling from Wizards of the Coast
- 5 October 2018The triggered ability of Firemind’s Research resolves before the spell that caused it to trigger. It resolves even if that spell is countered.