Daybreak Chimera — ruling 1

To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions (such as that of Daybreak Chimera). The mana value of the spell remains unchanged, no matter what the total cost to cast it was.

Daybreak Chimera — ruling 2

The cost reduction ability reduces only the generic mana in Daybreak Chimera's cost. The colored mana must still be paid.

Daybreak Chimera — ruling 3

Once you announce that you're casting a spell, no player may take actions until the spell has been paid for. Notably, opponents can't try to change by how much Daybreak Chimera's cost is reduced.

Daybreak Chimera — ruling 4

Colorless and generic mana symbols ({C}, {0}, {1}, {2}, {X}, and so on) in mana costs of permanents you control don't count toward your devotion to any color.

Daybreak Chimera — ruling 5

Mana symbols in the text boxes of permanents you control don't count toward your devotion to any color.

Daybreak Chimera — ruling 6

Hybrid mana symbols, monocolored hybrid mana symbols, and Phyrexian mana symbols do count toward your devotion to their color(s).

Daybreak Chimera — ruling 7

If an activated ability or triggered ability has an effect that depends on your devotion to a color, you count the number of mana symbols of that color among the mana costs of permanents you control as the ability resolves. The permanent with that ability will be counted if it's still on the battlefield at that time.

Daybreak Chimera — ruling 8

If you put an Aura on an opponent's permanent, you still control the Aura, and mana symbols in its mana cost count towards your devotion.

Daybreak Chimera : règles, fonctionnement et interactions (MTG)

Daybreak Chimera 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

This spell costs less to cast, where X is your devotion to white. (Each in the mana costs of permanents you control counts toward your devotion to white.) Flying

How it works : Daybreak Chimera

Original English text — Wizards of the Coast / Scryfall

#1January 24, 2020· Wizards of the Coast
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions (such as that of Daybreak Chimera). The mana value of the spell remains unchanged, no matter what the total cost to cast it was.
No other card is named in this ruling.
#2January 24, 2020· Wizards of the Coast
The cost reduction ability reduces only the generic mana in Daybreak Chimera's cost. The colored mana must still be paid.
No other card is named in this ruling.
#3January 24, 2020· Wizards of the Coast
Once you announce that you're casting a spell, no player may take actions until the spell has been paid for. Notably, opponents can't try to change by how much Daybreak Chimera's cost is reduced.
No other card is named in this ruling.
#4January 24, 2020· Wizards of the Coast
Colorless and generic mana symbols (, , , , , and so on) in mana costs of permanents you control don't count toward your devotion to any color.
No other card is named in this ruling.
#5January 24, 2020· Wizards of the Coast
Mana symbols in the text boxes of permanents you control don't count toward your devotion to any color.
No other card is named in this ruling.
#6January 24, 2020· Wizards of the Coast
Hybrid mana symbols, monocolored hybrid mana symbols, and Phyrexian mana symbols do count toward your devotion to their color(s).
No other card is named in this ruling.
#7January 24, 2020· Wizards of the Coast
If an activated ability or triggered ability has an effect that depends on your devotion to a color, you count the number of mana symbols of that color among the mana costs of permanents you control as the ability resolves. The permanent with that ability will be counted if it's still on the battlefield at that time.
No other card is named in this ruling.
#8January 24, 2020· Wizards of the Coast
If you put an Aura on an opponent's permanent, you still control the Aura, and mana symbols in its mana cost count towards your devotion.
No other card is named in this ruling.