Yodungrnir, the Meteorstorm

First strike, vigilance
Whenever Yodungrnir, the Meteorstorm goes into
your graveyard from anywhere, shuffle it and any number of creatures from your graveyard and
put them on top of your library.
{t}: Yodungrnir deals X damage to any target,
where X is equal to the amount of damage dealt
to creature tokens last turn. You gain that much
life.