Lake Silencio — ruling 1

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

Lake Silencio — ruling 2

Players may turn face-down creatures face up while a spell with split second is on the stack.

Lake Silencio — ruling 3

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

Lake Silencio — ruling 4

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

Lake Silencio — ruling 5

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.

Lake Silencio — ruling 6

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.

Lake Silencio — ruling 7

If a triggered ability causes the planar controller to planeswalk away from Lake Silencio, its ability no longer gives spells split second and players can respond to spells and abilities as normal.

Lake Silencio : règles, fonctionnement et interactions (MTG)

Lake Silencio 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

Still Point in Time — All spells 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.) Whenever chaos ensues, Lake Silencio deals 6 damage to target creature an opponent controls. If a creature dealt damage this way would die this turn, exile it instead.

How it works : Lake Silencio

Original English text — Wizards of the Coast / Scryfall

#1October 13, 2023· Wizards of the Coast
Players still get priority while a spell 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.
#2October 13, 2023· Wizards of the Coast
Players may turn face-down creatures face up while a spell with split second is on the stack.
No other card is named in this ruling.
#3October 13, 2023· Wizards of the Coast
Split second doesn't stop triggered abilities from triggering, such as that of Chalice of the Void. 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.
#4October 13, 2023· 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.
#5October 13, 2023· 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.
#6October 13, 2023· 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.
#7October 13, 2023· Wizards of the Coast
If a triggered ability causes the planar controller to planeswalk away from Lake Silencio, its ability no longer gives spells split second and players can respond to spells and abilities as normal.
No other card is named in this ruling.