Cheapest priced copy (Commander 2016): $0.35 at Card Kingdom, near mint, their price list as of .
Zhur-Taa Druid 
Creature — Human Druid · 1/1 · Common · Dragon's Maze · #120
{T}: Add {G}.
Whenever you tap this creature for mana, it deals 1 damage to each opponent.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
5 printings · $0.35 to $2.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2016 | 232 | Common | $0.35 | — |
| Duel Decks: Heroes vs. Monsters | 48 | Common | $0.35 | — |
| Dragon's Maze | 120 | Common | $0.35 | $2.99 |
| RNA Guild Kit | 101 | Common | $0.69 | — |
| The List | C16-232 | Common | $0.35 | — |
3 rulings from Wizards of the Coast
- 15 April 2013Zhur-Taa Druid’s last ability isn’t a mana ability. It uses the stack and can be responded to.
- 15 April 2013Zhur-Taa Druid’s last ability doesn’t trigger if it becomes tapped for any other reason. However, if Zhur-Taa Druid gains another mana ability that requires you tap it, its ability will trigger.
- 15 April 2013If you tap Zhur-Taa Druid for mana during the process of casting a spell or activating an ability, its triggered ability will resolve before that spell or ability.