I'll add back in a UnitExists trigger to the next release (it'll be under Support Triggers). Completely forgot about that, sorry.
The end result would be you'd have the buff/debuff aura, and a UnitExists support trigger to make sure that you have a target before allowing it to show. It's a bit of an extra hoop to jump through, but it's the cleanest solution.
Mage bomb as a buff/debuff aura, or as a cooldown aura? I'm investigating the latter.
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