Enchantment
Whenever you cast an instant or sorcery spell, create an X/X colorless Construct artifact creature token, where X is that spell's mana value.
, Exile Metallurgic Summonings: Return all instant and sorcery cards from your graveyard to your hand. Activate only if you control six or more artifacts.
The number of artifacts you control is checked only as you activate Metallurgic Summonings's last ability. It's not checked again as it resolves.