Myr Retriever | Ashnod's Altar | Ultron, Artificial Malevolence

Cards

Cast
Myr Retriever by paying ({2} magic symbol) .
When
Myr Retriever enters,
Ultron triggers.
Holding priority, activate
Ashnod's Altar by sacrificing
Myr Retriever, adding ({C} magic symbol) ({C} magic symbol) .
When
Myr Retriever dies, it triggers, returning an artifact card from your graveyard to your hand.
Resolve the
Ultron trigger, causing you to pay ({2} magic symbol) to create a token copy of
Myr Retriever.
Activate
Ashnod's Altar by sacrificing the
Myr Retriever token, adding ({C} magic symbol) ({C} magic symbol) .
When the
Myr Retriever token dies, it triggers, returning the nontoken
Myr Retriever from your graveyard to your hand.
Repeat.

This combo has been estimated to be Exhibition (Bracket 1+).