Dr.Mundo, the Madman

Hexproof Shield (Block the first spell targeting
this card, lose Hexproof Shield after)
When losing Hexproof Shield, create Chemical
Canister, an artifact with "At the beginning of
your upkeep, Sacrifice Chemical Canister and
give Dr.Mundo, the Madman an Hexproof
Shield."
"Hi there, patient. Looks like you got too
many parts."