If two continuous effects from the same layer conflict, which one wins?

When two continuous effects occupy the same layer (and sublayer) and conflict with each other, the rules use timestamp order as the default tiebreaker: the effect with the later timestamp applies last and therefore wins (CR 613.7). A timestamp is assigned when a permanent enters the battlefield, an aura is attached, or a static ability begins applying.

However, timestamp order is overridden by dependency (CR 613.8). Effect A is dependent on Effect B if applying B first would change what A does or which objects A affects. When dependency exists, the dependent effect is applied after the effect it depends on, regardless of timestamps. This prevents nonsensical results where the order of application would undermine the logic of the effects.

Both rules apply within the same layer and sublayer. Effects in different sublayers never truly 'conflict' in the timestamp sense — they are simply applied in sublayer order (CR 613.3), so sublayer position is checked before timestamp ever matters.

Concrete example: You control a Conspiracy naming Warrior (making all your creatures Warriors) and your opponent controls a Magus of the Moon (nonbasic lands become Mountains). Neither effect depends on the other, so their timestamps are irrelevant to each other — they are in different layers entirely (layer 4 for type-changing, layer 4 again but nonbasics). Now consider two Auras: Mutavault (all creature types) enters first, then your opponent enchants it with an Aura removing all subtypes. The later Aura has the later timestamp, so it applies after and overrides the subtype grant — the creature loses its subtypes despite Mutavault's ability.

Key rules to remember: CR 613.7 (timestamp order), CR 613.8 (dependency overrides timestamp), and CR 613.3 (sublayer sequencing). When in doubt at the same sublayer with no dependency, the newer effect wins.