Gempalm Polluter

Cycling {B}{B} ({B}{B}, Discard this card: Draw a card.)
When you cycle this card, you may have target player lose life equal to the number of Zombies on the battlefield.

Aetherdrift Commander

The List

Historic Anthology 3

Cycling {B}{B}
When you cycle Gempalm Polluter, you may have target player lose life equal to the number of Zombies on the battlefield.

Legions

Cycling {B}{B} ({B}{B}, Discard this card from your hand: Draw a card.)
When you cycle Gempalm Polluter, you may have target player lose 1 life for each Zombie in play.

The cycling ability and the triggered ability are separate. If the triggered ability doesn't resolve (because, for example, it has been countered, or all of its targets have become illegal), the cycling ability will still resolve, and you'll draw a card.

When you cycle this card, first the cycling ability goes on the stack, then the triggered ability goes on the stack on top of it. The triggered ability will resolve before you draw a card from the cycling ability.

You can cycle this card even if there are no legal targets for the triggered ability.