Thadric, the Brawler King

Noncreature artifacts are equipment and have "Equip: {x}" and "Equipped creature gets +X/+0" where X is the artifact's converted mana cost. (This is in addition to other text the artifact has)
Sacrifice an artifact: Thadric gets +X/+X until
end of turn, where X is the artifact's converted mana cost.
"See this rock? I'm going to kill you with it."