Riyar, Master of Bygone Ways

Whenever Riyar, Master of Bygone Ways deals
combat damage to a player, put target creature
that player controls on top of its owner's library.
Whenever Riyar, Master of Bygone Ways
becomes blocked, defending player mills cards
equal to the blocking creature's power. Prevent
1 damage to Riyar for each creature milled this
way.