Masked Rigger

Whenever Masked Rigger deals combat damage to
a player, create a Treasure token.
Whenever an artifact leaves the battlefield, put a
+1/+1 counter onto Masked Rigger.
{3}{b}{b}: Masked Rigger becomes unblockable
until end of turn. This ability costs {1} less to
activate for each artifact card in your graveyard.
"I'll be taking that..."