It's a common assumption that split second means a spell can do absolutely anything without restriction, but that's not accurate. Split second only controls what players can do in response; it says nothing about what a spell is allowed to target.
That distinction matters most when a split-second spell runs into hexproof or protection, two of Magic's most common targeting restrictions.
This guide breaks down exactly where split second's power ends and where normal targeting rules still apply in full.
The rules interactions described here follow directly from how targeting restrictions and split second are each independently defined.
Split second restricts what other players can cast or activate while a split-second spell is on the stack. It has nothing to do with what the split-second spell itself is legally allowed to target once it's cast.
Those are two completely separate rules questions, and conflating them is the source of most confusion around this interaction.
Hexproof means a permanent or player can't be the target of spells or abilities their opponents control, and that restriction is checked the moment a spell is cast, not during the window it sits on the stack. A split-second spell with a hexproof creature as its intended target simply can't be cast targeting that creature in the first place.
In other words, split second never gets the chance to overpower hexproof, because the targeting restriction is enforced before split second's response-blocking effect even becomes relevant.
Protection from a color, for example, also prevents a permanent from being targeted by spells of that color, and this restriction is checked at the same moment as any other targeting requirement. A split-second burn spell in a color a creature has protection from simply cannot legally target that creature.
This holds true regardless of the split-second clause, since protection's targeting restriction operates at a more fundamental rules layer than split second's stack-based restriction.
Legolas's Quick Reflexes is a genuinely interesting case study, since it's a split-second spell that also grants hexproof to its own target as part of its effect. This shows the two abilities working together within a single card rather than in opposition, since the hexproof is granted after the spell already legally resolved onto its chosen target.
That card is a good reminder that split second and hexproof aren't rival mechanics; they simply operate at different points in the process of casting and resolving a spell.
Players sometimes assume unanswerable and untargetable mean the same thing, but they describe entirely different rules concepts. Split second makes a spell unanswerable once it's already been legally cast; hexproof and protection determine whether it was ever legal to cast that spell targeting a given permanent in the first place.
Keeping those two ideas distinct clears up nearly every point of confusion around this interaction.
A deck relying on a split-second removal spell should still account for opponents running hexproof or protection effects, since those remain fully effective defenses regardless of the split-second clause. Split second solves the problem of an opponent responding with a trick or counterspell; it does not solve the problem of an illegal or unavailable target.
This means split second and evasion-style protection effects actually answer two different problems, and a well-built deck often wants tools for both.
If a spell couldn't legally target something without split second, it still can't legally target that thing with split second attached. The keyword only ever affects what happens after a legal spell is already on the stack, never the legality of the targeting itself.
That single sentence resolves the vast majority of questions players have about this specific interaction.
This same logic extends to shroud and to protection from all colors; any ability that restricts legal targeting is checked before split second's stack-based restriction ever comes into play. Split second never retroactively makes a previously illegal target legal.
Internalizing this single rule makes it much easier to correctly evaluate any future card that combines split second with an unfamiliar targeting-restriction ability.
No, hexproof still fully prevents that targeting.
Yes, if the spell's color or type matches the protection.
Yes, Legolas's Quick Reflexes grants hexproof as part of its effect.
Split second never makes an illegal target legal.
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