Sigil of Aether (Blue)

At the beginning of your action phase, destroy this.

When this leaves the arena, deal 1 arcane damage to any target. If damage is dealt this way, amp 1.

Rulings

From the Rosetta + 1st Strike release notes

Sigil of Aether’s first ability triggers at the beginning of your action phase. Players receive priority during this phase and will have an opportunity to resolve other cards and effects before this triggered layer resolves.
Sigil of Aether’s second ability triggers when it leaves the arena (for example, when it is destroyed, when it is banished, etc.), even from its own effect. When you add the triggered effect to the stack, you must announce your target for the deal arcane damage effect it will generate. When the trigger resolves on the stack, you will deal 1 arcane damage to that target.
You will generate the Amp 1 replacement effect only after you have dealt arcane damage to your target with the preceding effect. This Amp 1 effect will not retroactively increase the amount of arcane damage dealt by the preceding effect.

Keyword notes

Amp - The next time you would deal arcane damage this turn, instead deal that much plus 1.

Amp is an effect keyword.
Amp generates a replacement effect that applies to any one event of arcane damage that the player controls. This can include arcane damage events that are generated from actions, weapons (e.g. Kraken’s Aethervein), heroes (e.g. Brainstorm), etc.
If an effect would deal 0 arcane damage, it’s the same as no effect occurring, and therefore Amp does not apply to it.
For cards with an effect that deals arcane damage to multiple heroes/allies (e.g. Forked Lightning, Singe, Aether Arc), amp will only increase the damage dealt by the first arcane damage event from the effect. For example, if you target two different heroes with Forked Lightning, Forked Lightning’s effect will result in two arcane damage events. Amp will apply to the first arcane damage event against one of the targeted heroes, but will not apply to the other arcane damage event against the other hero.
If you have a melded split card that has an effect that deals arcane damage on each half of the card (e.g. Comet Storm||Shock), amp will be applied to the first available arcane damage event from that layer after the amp replacement effect has been generated. If an amp effect is active before the melded split card’s layer resolves for the first time, then that amp will apply to the arcane damage event produced by effect on the right side of the card. Similarly, if an amp effect is active before the melded split card’s layer resolves for the second time, then that amp replacement effect will apply to the arcane damage event produced by effect on the left side of the card.

All keywords

ClassWizard

TypeInstant

SubtypesAura

Cost0

Arcane1

PitchBlue

KeywordsAmp 1

SetsLGS, ROS

Legal inClassic Constructed, Blitz, Living Legend, Ultimate Pit Fight

ArtistsDaniel Jiménez, Mario Wibisono

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