Sudden Substitution

two generic mana one blue mana Instant

Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.)

Exchange control of target noncreature spell and target creature. Then the spell's controller may choose new targets for it.

"Bow before the might of—wait, what?"

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Showing Commander 2019#11

Price

7.10 $

8 printings

Daily estimate from Scryfall, not a shop quote.

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Sudden Substitution rulings

2021-03-19
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.
2021-03-19
Players may turn face-down creatures face up while a spell with split second is on the stack.
2021-03-19
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.
2021-03-19
Casting a spell with split second won't affect spells and abilities that are already on the stack.
2021-03-19
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.
2021-03-19
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.
2019-08-23
A mana ability is an ability that produces mana, not an ability that costs mana.
2019-08-23
In a multiplayer game, if the controller of one of the objects leaves the game after Sudden Substitution resolves, the effect that gave them control of the spell or permanent expires. If the spell is still on the stack, the player who gains control of it this way can't choose new targets for it.
2019-08-23
If the target spell or the target creature is an illegal target as Sudden Substitution resolves, the exchange won't happen. If both targets are legal but are both controlled by the same player, the exchange won't happen.
2019-08-23
If the exchange doesn't happen but the spell is still a legal target, its controller may choose new targets for it.
2019-08-23
The noncreature spell is still on the stack after exchanging control, and the creature is still on the battlefield.
2019-08-23
If a permanent spell is exchanged this way, its new controller will control the permanent it becomes.
2019-08-23
The exchange lasts indefinitely. It doesn't expire for the spell if the creature changes zones or leaves the game, or vice versa.

Sudden Substitution keyword rules

Split second Rule 702.61

Split second is a static ability that functions only while the spell with split second is on the stack. “Split second” means “As long as this spell is on the stack, players can’t cast other spells or activate abilities that aren’t mana abilities.”

Players may activate mana abilities and take special actions while a spell with split second is on the stack. Triggered abilities trigger and are put on the stack as normal while a spell with split second is on the stack.

Multiple instances of split second on the same spell are redundant.