Workshop Assistant, adding ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) that can only be spent to activate abilities of artifacts or to cast artifact spells.
Workshop Assistant dies, triggering itself and
Slobad.
Resolve the
Workshop Assistant trigger, returning
Myr Retriever from your graveyard to your hand.
Resolve the
Slobad trigger, untapping it.
Cast
Myr Retriever by paying ({2} magic symbol) .
Activate
Slobad by tapping it and sacrificing
Myr Retriever, adding ({R} magic symbol) ({R} magic symbol) that can only be spent to activate abilities of artifacts or to cast artifact spells.
Myr Retriever dies, triggering itself and
Slobad.
Resolve the
Myr Retriever trigger, returning
Workshop Assistant from your graveyard to your hand.