Siren Horn
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Siren Horn • Saurian • Upgrade • Uncommon • This creature gains, “Before Fight: Move 1 from this creature to the creature it fights.” • Artist: Konstantin Turovec • Card Number: MM:212, DT:164, MoMu:227
Official Rulings
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Assault damage occurs at the same timing point as "Before Fight:" abilities, so the active player (you) gets to choose which order to resolve them in.Source: Rulebook
If I have Siren Horn (MM 212) on a creature with Assault 2, and I attack an enemy creature with only 2 health remaining, does the Assault damage destroy them before or after I can move an Æmber onto them?
Assault damage occurs at the same timing point as "Before Fight:" abilities, so the active player (you) gets to choose which order to resolve them in.
Source: Rulebook
Commentary
The additional Fight: ability granted by Siren Horn is resolved along with any other Fight: abilities of the creature, in the order of the active player's choosing.
Source: Fight