The Great Grey Wolf Sif

Trample
If Artorias dies search library and graveyard for Artorias's Sword, and equip it to Sif. Whenever Sif dies or is exiled destroy target creature.
{5}{b}{b}: Monstrosity 5. (If this creature isn't monstrous, put five +1/+1 counters on it and it becomes monstrous.)
"Waiting for my savior, friend, and only family."