In my last local (?) tournament there's been an issue about Skill Drain and Veiler.
The judge said that while Skill Drain's effect is applied, Rescue Rabbit can't be targeted by Veiler because you can't negate an effect that was already negated.
As a support, he also provided Majestic Star Dragon's Ruling
And That Fabled Unicore can't negate and destroy a monster if its effect was negated earlier.
#my local tournament is unofficial btw.
The judge said that while Skill Drain's effect is applied, Rescue Rabbit can't be targeted by Veiler because you can't negate an effect that was already negated.
As a support, he also provided Majestic Star Dragon's Ruling
MSD can't negate effect that was negated
And That Fabled Unicore can't negate and destroy a monster if its effect was negated earlier.
Suppose "Shadow-Imprisoning Mirror" and "The Fabled Unicore" are both face-up on the field, and a player Tribute Summons "Caius the Shadow Monarch". If both players have the same number of cards in their hands when resolving the effect of "Caius the Shadow Monarch", then the turn player's effect negates the effect of "Caius the Shadow Monarch". Or, if the same player controls both "Shadow-Imprisoning Mirror" and "The Fabled Unicore", then that player chooses which effect negates the effect of "Caius the Shadow Monarch".[3]
#my local tournament is unofficial btw.