limitations of the undo system allow for partial payment
Original report: https://www.slightlymagic.net/forum/viewtopic.php?f=26&t=21769&start=30#p223695
I think Insolent Neonate is not behaving properly. My understanding of the card is that if you choose to activate the ability that reads "Discard a card, Sacrifice Insolent Neonate: Draw a card", then you have to complete both actions. To be more specific, it seems under the current version (including the latest Snapshot build), you can choose to discard a card, and then it prompts you to choose whether you want to sacrifice Insolent Neonate. If you say No, you don't lose the creature nor do you draw a card but the card you discarded remains in the graveyard. I'm pretty sure that's not supposed to happen. If you want to allow the opportunity to cancel the ability, that's fine, but I don't think you're supposed to just be able to use Insolent Neonate as a permanent unconditional discard outlet.