Creature — Human Druid Shaman 1/1, 2R (3)
Uncommon
At the beginning of your end step, if you control a creature with power 5 or greater, you may have Exuberant Firestoker deal 2 damage to target player.
{T}: Add {1} to your mana pool.
The artistry of Etlan's firedancers is more spectacular when behemoths join in.
Illus. Zoltan Boros & Gabor Szikszai

10/1/2008: The first ability has an "intervening 'if' clause." That means (1) the ability won't trigger at all unless you control a creature with power 5 or greater as your end step begins, and (2) the ability will do nothing if you don't control a creature with power 5 or greater by the time it resolves. (It doesn't have to be the same creature as the one that allowed the ability to trigger.) Power-boosting effects that last "until end of turn" will still be in effect when this kind of ability triggers and resolves. An ability like this will trigger a maximum of once per turn, no matter how many applicable creatures you control.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern