Arcane Proxy Bug
I owned/controlled Surrak and Goreclaw and the opponent had a Vorinclex, Monstrous Raider as I cast Arcane Proxy for 7 (no prototype).
I also had a Commit // Memory in my graveyard as the only legal target.
Arcane Proxy resolved, and I put the Surrak and Goreclaw trigger to resolve first—which it did. Arcane Proxy did not receive a +1/+1 counter because of the Vorinclex and it gained Haste and Trample until the end of the turn, but the Arcane Proxy ETB trigger seems to have fizzled and did not let me exile Commit or copy it.
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Rezzahan#77802 commented
Commit // Memory has a mana value of 10 (!!!) in the graveyard, and is thus not a legal target for your Arcane Proxy's trigger. As the only instant/sorcery in your graveyard, the trigger can't be put on the stack with a legal target, so it is removed.