Can't target Lutri the Spellchaser with the copy of Fertilid's Favor when no other creatures controlled
I was playing in a sealed event when this bug came up. I cast Fertilid's Favor with no other creatures controlled, just targeting myself for the player portion. With that on the stack, I cast Lutri. Lutri resolved and targetted the Fertilid's Favor on the stack. However, the copy would only target a player, and would not allow me to target the Lutri for the two counters.
Expected result would be to target Lutri for the two +1/+1 counters.
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[Deleted User] commented
Arena handled that correctly. The number of targets is chosen when you cast the original spell, and is locked in as one of the choices made for the cast. This choice is copied for the copy of your spell, and you can't change the number. You chose 0 for the original, so 0 it is for the copy.