Edgar, Master Machinist — ruling 1

You must still pay all costs and follow any timing restrictions and permissions for artifact spells you cast from your graveyard this way. Normally, you'll be able to cast them only during your main phase while the stack is empty.

Edgar, Master Machinist — ruling 2

Edgar must be under your control in order to start casting an artifact spell using its first ability, but it doesn't need to stay under your control throughout that process or be under your control as the spell resolves. If, for example, you sacrifice Edgar to pay an additional cost of the spell or Edgar is destroyed in response, the spell will still resolve normally.

Edgar, Master Machinist — ruling 3

The value of X is calculated only once, as Edgar's last ability resolves.

Edgar, Master Machinist — ruling 4

If an artifact you control has {X} in its mana cost, X is 0 for the purpose of calculating its mana value.

Edgar, Master Machinist : règles, fonctionnement et interactions (MTG)

Edgar, Master Machinist is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Once during each of your turns, you may cast an artifact spell from your graveyard. If you cast a spell this way, that artifact enters tapped. Tools — Whenever Edgar attacks, it gets +X/+0 until end of turn, where X is the greatest mana value among artifacts you control.

How it works : Edgar, Master Machinist

Original English text — Wizards of the Coast / Scryfall

#1June 6, 2025· Wizards of the Coast
You must still pay all costs and follow any timing restrictions and permissions for artifact spells you cast from your graveyard this way. Normally, you'll be able to cast them only during your main phase while the stack is empty.
No other card is named in this ruling.
#2June 6, 2025· Wizards of the Coast
Edgar must be under your control in order to start casting an artifact spell using its first ability, but it doesn't need to stay under your control throughout that process or be under your control as the spell resolves. If, for example, you sacrifice Edgar to pay an additional cost of the spell or Edgar is destroyed in response, the spell will still resolve normally.
No other card is named in this ruling.
#3June 6, 2025· Wizards of the Coast
The value of X is calculated only once, as Edgar's last ability resolves.
No other card is named in this ruling.
#4June 6, 2025· Wizards of the Coast
If an artifact you control has in its mana cost, X is 0 for the purpose of calculating its mana value.
No other card is named in this ruling.