原文If the target Villain is an illegal target as Doctor Doom's last ability resolves, it won't resolve and none of its effects will happen. You won't draw or discard.
原文Once an ability that causes a creature to connive begins to resolve, no player may take any other actions until it's done. Notably, opponents can't try to remove the conniving creature after you discard a nonland card but before it receives a +1/+1 counter.
原文If no card is discarded, most likely because that player's hand is empty and an effect says they can't draw cards, the conniving creature does not receive a +1/+1 counter.
原文If a resolving spell or ability instructs a specific creature to connive but that creature has left the battlefield, the creature still connives. If you discard a nonland card this way, you won't put a +1/+1 counter on anything. Abilities that trigger "whenever a creature you control connives" will trigger.