Creature — Elf Druid 2/1, 1G (2)
Common
When Quirion Sentinel enters the battlefield, add one mana of any color to your mana pool.
All elvenkind stood against Phyrexia. The Quirion nation deployed its most spiritual adepts, who wielded the power of their native soil.
Illus. Heather Hudson

8/1/2008: This is not a mana ability. It uses the stack, and can be responded to.
10/1/2009: You get the mana whether you want it or not. If you don't spend it, it will disappear at the end of the current step (or phase).
1/25/2011: You get the mana whether you want it or not. If you don't spend it, it will disappear at the end of the current step (or phase).
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander