Return the Favor bugged out
My Return the Favor using mode “Copy target instant spell, sorcery spell, etc etc” added counters to my opponent's creature and did not allow me to take a card from their hand when copying Render Speechless. I even chose the option to not put counters on a creature.
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Rezzahan#77802
commented
Cannot say anything about the discard part, since there is not enough information. Maybe they had only lands in hand?
The "counters on up to one target creature" part I can explain. You are copying a spell, which allows you to change targets. This does not allow you to change modes or number of targets. Your copy of the spell must have the same modes and the same number of targets as the original. If your opponent chose a target creature to put counters on, so must you. If there is no other target, then you have to target their creature.