Scrap Spawn

Affinity for artifacts (This spell costs 1 less to cast for each artifact you control.)
Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)
"We've determined biologically hazardous materials cultivated with discarded tech over time, creating what we like to call, happy accidents."
— Delta Demar, Lead Biotech