Mirkwood Bats

Flying
Whenever you create or sacrifice a token, each opponent loses 1 life.

Panharmonicon

If an artifact or creature entering causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.

{T}, Sacrifice another creature: Add {B}{B}{B}. Spend this mana only to cast Vampire, Cleric, and/or Demon spells.

Whenever a creature you control enters, this enchantment deals 1 damage to each opponent.