The original spell that was copied will be exiled as an adventure spell normally is and you can cast the other half later by paying its cost
I'm talking about Wellwisher
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If you have two spiders on the bench the attack gets particularly lethal
For that reason, it feels logical to look at Even the Score as an almost modal spell that can be cast late with a big , but also has value in games when you cant afford to dedicate an entire turn to drawing