Arcanic Spike (Red)

Whether you’ve dealt arcane damage this turn is checked while this is attacking on the combat chain.

If you haven’t dealt arcane damage this turn, then deal arcane damage before attack damage is dealt, this will have +2 during damage calculation.

You don’t retroactively deal extra damage if you’ve gone past the Damage step (i.e. damage calculation) without dealing arcane damage, and then proceed to deal arcane damage.