Shadow of the Second Sun — ruling 1

The enchanted player's additional beginning phase will be a lot like their normal beginning phase. During the untap step, permanents will phase in or out as appropriate and they'll untap their tapped permanents. Anything they control that triggers "at the beginning of your upkeep" or similar will trigger during their upkeep step, and they'll eventually draw a card for their draw step.

Shadow of the Second Sun — ruling 2

The additional beginning phase all happens during the current turn. Any effects that last "until your next turn" or similar won't expire just because they'll go through an additional beginning phase.

Shadow of the Second Sun — ruling 3

After the additional beginning phase, the game proceeds to the ending phase (unless something has added even more phases; see below).

Shadow of the Second Sun — ruling 4

If multiple phases are added to the same point in your turn, the most recently created phase happens first. For example, say you are enchanted by Shadow of the Second Sun and its ability triggers during your postcombat main phase. Later during that same main phase, another effect gives you an additional combat phase after this main phase. The additional combat will happen first, followed by the additional beginning phase.

Shadow of the Second Sun — ruling 5

Even if the enchanted player doesn't attack with any creatures during combat, they'll still get a postcombat main phase and Shadow of the Second Sun's ability will still trigger.

Shadow of the Second Sun — ruling 6

If the enchanted player somehow has more than two main phases in a turn, each main phase other than the first one is a postcombat main phase, and Shadow of the Second Sun's ability triggers at the beginning of each of them.

Shadow of the Second Sun : règles, fonctionnement et interactions (MTG)

Shadow of the Second Sun 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

Enchant player At the beginning of each of enchanted player's postcombat main phases, there is an additional beginning phase after this phase. (The end step happens after the added untap, upkeep, and draw steps.)

Complete guide

Shadow of the Second Sun is a unique Aura that grants the enchanted player an extra beginning phase right in the middle of their turn. This powerful enchantment allows for double the untaps, upkeeps, and draws, significantly accelerating your resource generation. By manipulating the flow of time, you can effectively take a 'half-turn' during your postcombat main phase.

A Second Beginning

This card enchants a player and triggers at the start of their postcombat main phase. When it resolves, it schedules an additional beginning phase—consisting of an untap step, an upkeep step, and a draw step—to occur immediately after the current main phase concludes. Note that even if you didn't attack, your second main phase is still considered a postcombat main phase, so the ability will always trigger during that portion of your turn.

The Step-by-Step Breakdown

Once the postcombat main phase ends, the game doesn't go to the end step yet. Instead, you enter the new untap step where your permanents untap and phased-out cards return. Then, you move to the upkeep step where 'at the beginning of your upkeep' abilities trigger. Finally, you enter a draw step to draw your card for the turn. Only after this extra draw step does the game proceed to your regular ending phase.

Continuous Effects and Timing

It is important to remember that this additional phase happens within the same turn. Effects that last 'until end of turn' or 'until your next turn' do not expire during this extra beginning phase. Additionally, if you have multiple postcombat main phases due to other card effects, Shadow of the Second Sun will trigger at the start of each of them, potentially giving you multiple extra beginning phases.

Interaction examples

Double Mana and Resources

With Shadow of the Second Sun enchanting you, you can spend all your mana during your first main phase or combat. When you reach your postcombat main phase, the Aura triggers. After the main phase, you get an extra untap step to refresh all your lands and an extra draw step to get a new card, all before your turn actually ends.

Triggering Tribal Value

Kindred Discovery

If you have Kindred Discovery on the battlefield naming 'Wizards', and you cast a Wizard creature during your postcombat main phase, you draw a card. Then, the extra beginning phase from Shadow of the Second Sun starts. You untap, and if you have any other cards that trigger on upkeep or draw, Kindred Discovery remains on the field ready to trigger again if you manage to put more creatures into play during subsequent steps.

Copying Time

Reflections of Littjara

If you use Reflections of Littjara to copy a creature spell during your postcombat main phase, you get a token copy. Because Shadow of the Second Sun grants an extra untap step after this phase, any mana you spent on Reflections of Littjara or the creature spells will be available again during your opponent's turn, as your lands will untap during the extra beginning phase.

Guide written with AI from the official text and rulings. Official English text prevails.

How it works : Shadow of the Second Sun

Original English text — Wizards of the Coast / Scryfall

#1June 7, 2024· Wizards of the Coast
The enchanted player's additional beginning phase will be a lot like their normal beginning phase. During the untap step, permanents will phase in or out as appropriate and they'll untap their tapped permanents. Anything they control that triggers "at the beginning of your upkeep" or similar will trigger during their upkeep step, and they'll eventually draw a card for their draw step.
No other card is named in this ruling.
#2June 7, 2024· Wizards of the Coast
The additional beginning phase all happens during the current turn. Any effects that last "until your next turn" or similar won't expire just because they'll go through an additional beginning phase.
No other card is named in this ruling.
#3June 7, 2024· Wizards of the Coast
After the additional beginning phase, the game proceeds to the ending phase (unless something has added even more phases; see below).
No other card is named in this ruling.
#4June 7, 2024· Wizards of the Coast
If multiple phases are added to the same point in your turn, the most recently created phase happens first. For example, say you are enchanted by Shadow of the Second Sun and its ability triggers during your postcombat main phase. Later during that same main phase, another effect gives you an additional combat phase after this main phase. The additional combat will happen first, followed by the additional beginning phase.
No other card is named in this ruling.
#5June 7, 2024· Wizards of the Coast
Even if the enchanted player doesn't attack with any creatures during combat, they'll still get a postcombat main phase and Shadow of the Second Sun's ability will still trigger.
No other card is named in this ruling.
#6June 7, 2024· Wizards of the Coast
If the enchanted player somehow has more than two main phases in a turn, each main phase other than the first one is a postcombat main phase, and Shadow of the Second Sun's ability triggers at the beginning of each of them.
No other card is named in this ruling.