Quote from Argus Panoptes »Placing the "Whenever Ink-Eyes, Servant of Oni deals combat damage to a player, you may put target creature card from that player's graveyard onto the battlefield under your control." ability on the stack includes choosing a target for it. The target must be a creature card in that player's graveyard, not one that will only be in that graveyard Real Soon Now. No matter which order you choose, the "Whenever Mirko Vosk, Mind Drinker deals combat damage to a player, that player reveals cards from the top of his or her library until he or she reveals four land cards, then puts those cards into his or her graveyard." ability will not have resolved when you choose the target.
Ah, that makes perfect sense.
Thanks to the both of you for replying. I very much appreciate your having taken the time!