Metallurgic Summonings
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. {3}{U}{U}, Exile this enchantment: Return all instant and sorcery cards from your graveyard to your hand. Activate only if you control six or more artifacts.
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Official rulings (4) · Scryfall
Metallurgic Summonings's first ability resolves before the spell that caused it to trigger.
For a spell with {X} in its mana cost, use the value chosen for X to determine its mana value. For example, Clash of Wills is an instant spell with mana cost {X}{U}. If you chose 2 as the value of X, then Clash of Wills has mana value 3, and Metallurgic Summonings's ability will create a 3/3 token.
If Metallurgic Summonings's first ability resolves and the spell that caused it to trigger has been countered, use that spell's mana value as it last existed on the stack to determine the value of X.
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.