(Aura's stay in the arena until they are destroyed.)
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When an attack action card you control hits, destroy Bloodspill Invocation, then create a Runechant token. (It's an aura with "When you play an attack action card or activate a weapon attack, destroy Runechant and deal 1 arcane damage to target opposing hero.")
When your hero is dealt damage, destroy Bloodspill Invocation.