Samut, Tyrant of Naktamun — ruling 1

Players still get priority while a card with split second is on the stack; their options are just limited to mana abilities and certain special actions.

Samut, Tyrant of Naktamun — ruling 2

Split second doesn't stop triggered abilities from triggering. If one does, its controller puts it on the stack and chooses targets for it, if any. Those abilities will resolve as normal.

Samut, Tyrant of Naktamun — ruling 3

If the resolution of a triggered ability involves casting a spell, that spell can't be cast if a spell with split second is on the stack.

Samut, Tyrant of Naktamun — ruling 4

Casting a spell with split second won't affect spells and abilities that are already on the stack.

Samut, Tyrant of Naktamun — ruling 5

After a spell with split second resolves (or otherwise leaves the stack), players may again cast spells and activate abilities before the next object on the stack resolves.

Samut, Tyrant of Naktamun : règles, fonctionnement et interactions (MTG)

Samut, Tyrant of Naktamun 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

Instant and sorcery spells you control have split second. (As long as a spell with split second is on the stack, players can't cast spells or activate abilities that aren't mana abilities.)

How it works : Samut, Tyrant of Naktamun

Original English text — Wizards of the Coast / Scryfall

#1August 21, 2026· Wizards of the Coast
Players still get priority while a card with split second is on the stack; their options are just limited to mana abilities and certain special actions.
No other card is named in this ruling.
#2August 21, 2026· Wizards of the Coast
Split second doesn't stop triggered abilities from triggering. If one does, its controller puts it on the stack and chooses targets for it, if any. Those abilities will resolve as normal.
No other card is named in this ruling.
#3August 21, 2026· Wizards of the Coast
If the resolution of a triggered ability involves casting a spell, that spell can't be cast if a spell with split second is on the stack.
No other card is named in this ruling.
#4August 21, 2026· Wizards of the Coast
Casting a spell with split second won't affect spells and abilities that are already on the stack.
No other card is named in this ruling.
#5August 21, 2026· Wizards of the Coast
After a spell with split second resolves (or otherwise leaves the stack), players may again cast spells and activate abilities before the next object on the stack resolves.
No other card is named in this ruling.