Trample
Whenever Charnelhoard Wurm deals damage to an opponent, you may return target card from your graveyard to your hand.
If Charnelhoard Wurm is dealt lethal damage at the same time it deals damage to an opponent, Charnelhoard Wurm will be in your graveyard by the time you put its ability on the stack. In that case, you can target it with its own ability.