Council of the Absolute — ruling 1

If a spell with the chosen name includes one generic mana in its cost to cast, that cost will be reduced by {1}.

Council of the Absolute — ruling 2

The last ability can’t reduce the colored mana requirement of a spell.

Council of the Absolute — ruling 3

If there are additional costs to cast the spell, such as kicker costs, apply those increases before applying cost reductions.

Council of the Absolute — ruling 4

The last ability can reduce alternative costs such as overload costs.

Council of the Absolute — ruling 5

You can name either half of a split card, but not both. If you name half of a split card, your opponents can cast the other half. If that split card has fuse, your opponents can’t cast that card as a fused split card.

Council of the Absolute — ruling 6

If you name half of a split card with fuse, and then you cast both halves, the cost reduction will apply to the total cost of the spell. This is true even if the half with the chosen name requires only colored mana to cast.

Council of the Absolute : règles, fonctionnement et interactions (MTG)

Council of the Absolute 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

As this creature enters, choose a noncreature, nonland card name. Your opponents can't cast spells with the chosen name. Spells with the chosen name you cast cost less to cast.

How it works : Council of the Absolute

Original English text — Wizards of the Coast / Scryfall

#1April 15, 2013· Wizards of the Coast
If a spell with the chosen name includes one generic mana in its cost to cast, that cost will be reduced by .
No other card is named in this ruling.
#2April 15, 2013· Wizards of the Coast
The last ability can’t reduce the colored mana requirement of a spell.
No other card is named in this ruling.
#3April 15, 2013· Wizards of the Coast
If there are additional costs to cast the spell, such as kicker costs, apply those increases before applying cost reductions.
No other card is named in this ruling.
#4April 15, 2013· Wizards of the Coast
The last ability can reduce alternative costs such as overload costs.
No other card is named in this ruling.
#5April 15, 2013· Wizards of the Coast
You can name either half of a split card, but not both. If you name half of a split card, your opponents can cast the other half. If that split card has fuse, your opponents can’t cast that card as a fused split card.
No other card is named in this ruling.
#6April 15, 2013· Wizards of the Coast
If you name half of a split card with fuse, and then you cast both halves, the cost reduction will apply to the total cost of the spell. This is true even if the half with the chosen name requires only colored mana to cast.
No other card is named in this ruling.