Zephyr, the Dark Angel

{t}Sacrifice a creature, put X +1 +1 counters
on Zephyr, the Dark Angel where X is that creature's power
Remove X +1 +1 counters from Zephyr, the Dark Angel gain X life
"I am the storm that you fear, the darkness that you dread, the wings that you envy "- Zephyr, the Dark Angel