Does Prince fail to play its set aside Action card if that card is played as Way of the Turtle?
Question might seem to point toward an obvious “yes”. But, why would that be? Prince’s only failing clause for re-playing its set aside Action card is that ”you fail to set it aside on a turn you play it”. This is normally avoided by Prince’s auto set-aside on discard mechanic. But what if you use Way of the Turtle on that Action card? Technically, you played that card this turn; and you successfully set it aside on that very same turn. Why would Prince fail to re-play it on subsequent turns? Why would Prince care about what set the card aside, whether it was the Prince itself who did it or something else?
Dominion Online says that regardless of my above enquiry, Prince does indeed fail to re-play a Turtle’d card. My question is, why? What is it that causes this failure?
Anyway, thanks for the clarification!
It's because the stop moving rule doesn't work like that.
"If a card isn't where the effect would expect it to be, or
has moved away from there and then back, it can't move the card."
Let's say you Prince a Transmogrify. You play it, put it on your Tavern mat, then immediately call it (it's still the start of your turn). Even though that same Transmogrify will get discarded from play this turn, Prince can't set it aside anymore, because of the stop moving rule. When Transmogrify went onto the Tavern mat, Prince has lost the card.
So if you remove a Princed card from play with Turtle, Prince loses track for the same reason as my Transmogrify example.
Now you may wonder, why do we need a stop moving rule at all? Because without it, it causes chaos. For example:
-You gain an Inn with Replace.
-You shuffle the Inn into your deck.
-Replace (somehow) finds the Inn inside of your deck and topdecks it.
or
-You gain an Experiment with Summon.
-You set it aside with Cargo Ship.
-Summon takes the Experiment from Cargo Ship and sets it aside again.
-Next turn, you play the Experiment with Summon, returns it, and then Cargo Ship takes the Experiment out of the supply and puts it back in your hand.