Blades and area effect will add, because the effect occurs before the hit. The trap will not trigger because it's set before the prism. For the Myth trap to trigger you need to cast the prism first, then the trap. That way the spell is still Myth when it hits the trap THEN it hits the prism and converts to Storm. If you were using a Storm trap then you would cast the trap first and then the prism. Order of casting matters when converts are in play. This applies to shields as well. If an opponent casts a Myth Shield and then you cast a Myth Prism, the shield will be bypassed. If you cast a Myth Prism and THEN the opponent casts Myth Shield, the shield will trigger and defend them when you attack.
Blades and area effect will add, because the effect occurs before the hit. The trap will not trigger because it's set before the prism. For the Myth trap to trigger you need to cast the prism first, then the trap. That way the spell is still Myth when it hits the trap THEN it hits the prism and converts to Storm. If you were using a Storm trap then you would cast the trap first and then the prism. Order of casting matters when converts are in play. This applies to shields as well. If an opponent casts a Myth Shield and then you cast a Myth Prism, the shield will be bypassed. If you cast a Myth Prism and THEN the opponent casts Myth Shield, the shield will trigger and defend them when you attack.
boost, then use a prysm to turn 
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