Wormwood Reaper

Siphon 2 (As this creature enters the battlefield, you may pay 2 life. If you do, this creature enters the battlefield with an additional two +1/+1 counters on it.)
At the beginning of your upkeep, you lose 1 life. Then, put a +1/+1 counter on Wormwood Reaper.
At the beginning of your end step, destroy target artifact, creature, or enchantment whose converted mana cost is less than or equal to the total amount of life you lost this turn.