It's a Moon version of whatever you chose to copy as it entered. If you chose Moon-Yue again, that means it's another legendary land named Moon, so the Legend Rule will apply and you can only keep one of them.

In the layer system that determines an object's characteristics, the results of copy effects are applied very early in the order and text-changing, type-changing and ability adding/removing effects are applied later in the order. When you go through the steps of determining Vesuva's characteristics in your example, you start with Vesuva, layer on the results of its copy effect (here, becoming Princess Yue), then change the name to Moon, change the type to land-only (the legendary supertype is unchanged) and add the mana ability.

:(

Some more notes on the second part of your question: A triggered ability triggers whenever the given event happens. A trigger with an "intervening 'if' clause" (looks like "Whenever [event], if [condition], [effect]") checks its special condition twice: once when the given event happens and again right before the trigger starts resolving. If the first check isn't true then the ability doesn't trigger at all and if the second check isn't true, usually because someone's response changed something about the game state, then it's removed from the stack without resolving. Finest Hour's trigger does have an "intervening 'if' clause", but there's no way anyone's response or any other game event could somehow make the condition ("if it's the first combat phase of the turn") untrue before it starts resolving.

You get multiple triggers in this situation. Each one of those costs is a separate action and they get paid separately from each other, the big clue being the "in any order" notes from the rules you found (it's interesting that Sinister Concoction's text puts the mill near the front of the list while the rule seems to say you should do that after everything else).

The times when Moonshadow would only trigger once for multiple things moving would be if those things are truly moving simultaneously. Some common examples include an effect that makes you discard 2 cards, an effect that mills you for 5, an effect that destroys all artifacts, or multiple creatures dying from combat damage (probably the most common example).

Ah yes, that was the one.

Rmachowski: Answers to your question have been up for a while. Since there don't seem to be any follow-ups or corrections that need to be made, I marked one of them as the "Accepted answer" so this topic can move out of the list of unanswered questions. In the future you can take care of this yourself using the "Mark as Answer" button on the response that you feel is the most helpful answer to your question.

I saw a reference to this recently, don't remember if it was here on TappedOut or somewhere else, and it took me a few days to make the connection with your username and see if it was you. Great job.

Only the actual Spark Double copy will enter with an additional +1/+1 counter. Other copies it makes of itself won't get that. Spark Double's copy effect isn't adding another ability "[this] enters with an additional +1/+1 counter..." to its copiable characteristics, it's just giving you an additional instruction to follow as the copy effect is applied. In terms of abilities and other copiable values, it will just be a normal Watchful Radstag.

Malfegor could be good as another mass removal piece if you don't mind the discard, and if you want more recursion then Unburial Rites could also be useful.

Just once. It's okay for a creature to have negative power, there are even a couple who have been printed that way: Char-Rumbler, Spinal Parasite. That negative number can be used to do math or be compared to other numbers for higher/lower decisions, but if it's used to determine a result of something like damage, drawing cards, number of tokens, etc. then the result defaults to zero.

You can only apply Mirrormind Crown to one of those triggers, specifically the first one that resolves.

Additional triggered abilities are their own separate triggers from the original trigger. They get responded to separately, they resolve separately and they interact with other effects separately. This is different from replacement effects that double things (Doubling Season etc.), as they just double the result of the original event rather than creating additional events.

If a spell has targets, you have to choose them as part of the casting process, even before you pay the costs. Everyone will know what Explosive Singularity is targeting when other players are given a chance to respond after you cast it.

Consider that if you didn't choose targets until a spell started resolving, then cards like Keep Safe or Redirect Lightning wouldn't be able to work properly.

To be clear for anyone who comes along later: there aren't any state based effects/actions happening here. They're all triggered abilities (start with "when/whenever/at"), and a triggered ability will trigger whenever its condition is met. The End phase of a turn is still happening during that turn and triggered abilities can trigger from any event that happens during that phase.

rockgobbler: Since it appears you got a satisfactory answer to your question and there don't seem to be any follow-ups or corrections that need to be made, I marked it as the "Accepted answer" so this topic can move out of the list of unanswered questions. In the future you can take care of this yourself using the "Mark as Answer" button on the response that you feel is the most helpful answer to your question.

You can use double square brackets around a card's name to create a reference link: Skill Borrower, Ancient Den. It's the best way to help make sure everyone understands what's going on in the question.

Yes, Skill Borrower can tap for mana in that example. Skill Borrower's ability will work with any kind of artifact and any kind of creature. If it were just meant to work with cards with only the "artifact" type and nothing else or only the "creature" type and nothing else then it would be written in a more specific way to make that clear.

Example of a goad effect for reference: Besmirch

You'll have to send the Dreadmaw at opponent B. When dealing with different requirements and restrictions on how you declare attackers, a legal attack is one that satisfies the maximum number of requirements without breaking any restrictions. The one restriction here is B's Crawlspace, so you can't send more than two creatures B's way. Goad sets up two requirements: the creature has to attack and it has to attack someone other than the player who goaded it if possible. Sending Dreadmaw at A and two creatures at B only satisfies one requirement from goad, but sending Dreadmaw at B (with a friend or not) satisfies two requirements of goad, so that's how you have to declare attackers.

Type-changing effects are applied in an earlier layer than ability granting/removing effects, so that's why Ashaya's effect still gets applied.

I think I understand more of your question about Clone. Clone's ability to copy something is not, in itself, a copy effect. It's a static ability with a replacement effect that modifies how Clone enters the battlefield and it creates a copy effect as it's applied. Xu-Ifit is removing Clone's static ability at the time it would normally be applied, so the copy effect is never created. When Clone gets to the battlefield and you start going through the steps of layers to determine Clone's characteristics, there's nothing in layer 1 (the copy effect layer) to consider, so it's just a 0/0 Skeleton of itself with no abilities.