Now, I realize this issue is covered by rule 712.1a: Multiple player-controlling effects that affect the same player overwrite each other. The last one to be created is the one that works.
But my issue is that this rule isn't consistent. For example: with yosei, the morning star, if you trigger his on dying ability multiple times in a turn the player skips that many untap steps in a row. why is it not the same for mindslaver? Or, better yet, why aren't multiple triggers of yosei redundant?
The reason why Yosei's effect works this way is that it's a replacement effect, as all effects that make you skip a step, phase or turn. If multiple replacement effects could apply to the same event as it would happen, the affected player chooses one to apply, and the other effects can also apply only if they are applicable to the event as modified by the first. If you have multiples of Yosei's effect pending, the first applied makes it so there is no more untap step this turn, so the other(s) aren't applicable, and thus stay in place and wait for the next event they can replace (here, the next untap step). Mindslaver's effect can only apply to the affected player's next turn, and if multiple such effects apply, they all apply to the same turn, being redundant if they give control of the player to the same player.
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I'm a former judge (lapsed), who keeps up to date on rules and policy. Keep in mind that judges' answers aren't necessarily more valid than those of people who aren't judges; what matters is we can quote the rules to back up our answers. When in doubt, ask for such quotes.
So what you're saying is that since the multiple instances of Yosei's trigger each remove an untap step from the turn, the remaining instances can no longer see what doesn't exist and apply to the next available untap step that hasn't been nullified.
Where as the mindslaver ability doesn't not remove anything and thus all instances of the ability can apply to the same target simultaneously, the last one that resolves being the one that takes precedence?
I'm a former judge (lapsed), who keeps up to date on rules and policy. Keep in mind that judges' answers aren't necessarily more valid than those of people who aren't judges; what matters is we can quote the rules to back up our answers. When in doubt, ask for such quotes.
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But my issue is that this rule isn't consistent. For example: with yosei, the morning star, if you trigger his on dying ability multiple times in a turn the player skips that many untap steps in a row. why is it not the same for mindslaver? Or, better yet, why aren't multiple triggers of yosei redundant?
Where as the mindslaver ability doesn't not remove anything and thus all instances of the ability can apply to the same target simultaneously, the last one that resolves being the one that takes precedence?