A: It’s true, the Creeper card does say “immediately draw another card to replace it” but this doesn’t mean you replace the Creeper on the table, discarding it. This means “replace the Creeper in the number of cards you drew.” If you needed to draw 3 cards, and you drew them and one of them was a Creeper, you play the Creeper and draw another card, because that Creeper doesn’t count as one of the 3 cards you needed to draw (neither does it count against the number of cards you get to Play on your turn), so you have only drawn 2 cards, so you still need to draw a third.

You’re not replacing the Creeper from it’s place “in play” (i.e. on the table). You’re just replacing the card “lost” as part of your draw count because it was a Creeper. The idea is that Creepers go into play automatically, whether you want them to or not. They’re usually a problem for you, and you have to work to get rid of them (though sometimes you need them for Goals, otherwise, they hinder you).