Call bull-poopie.
Wishing for more wishes should be completely out. There is no way that a single spell should have the power to make six more of the same spell. Especially a spell with an EXP cost of 5000xp. Not how the
Wish spell should work by any stretch of the imagination.
The
Wish spell says it has a minimum xp cost of 5000xp, or whatever the xp cost for the spell it is duplicating. Since you're duplicating a 5,000xp spell, it's definitely 5,000xp per the
Wishes in the ring, plus the three
Wish scrolls.
Even if you permitted this, you'd need to drain this PC of 30,000 xp for the creation of 6
Wish spell effects.
[EDIT- Depending upon what version of
Gate spell, that's another 1,000xp]
A level 4 character could potentially have between 6,000~9,999xp. This would knock him to at the very least -20,001xp and make him super dead. Like, raise as a Wight dead or something.
The line in the
Wish spell, "You may try to use a wish to produce greater effects than these, but doing so is dangerous." is very literally true here. Since there isn't enough xp to drain for the creation of these items, such some xp from the rest of the party, After you kill this PC and turn him into a Wight. If they're level 4 also (and closer to 6,000xp than 9,999) you might end up killing 3 more.
@
Herobizkit and @
Greenfield are absolutely correct on how difficult it should be for a level 4 Scout to cast a level 9 Arcane scroll. The mechanics for pulling this off should be out the the range of possibility for such a character, unless serious skill buffs. If the rest of the party supports the skill buffs to accomplish this, then most definitely drain xp from all those involved.
He clearly has a very specific goal in mind for how to use all of these, and has not told you want it is, but you can guess it'll be over the top. This is what's called taking advantage of someone. It's mean when a DM does it, it's mean when a player does it to a DM.
The above references are pure game, mechanical implications of what your player is asking. feel free to have this conversation about the side effects beforehand, and then possibly throw cheetos at this person and tell them to quit their shenanigans because next time they try to pull a stunt like this, you'll let them feel the effects WITHOUT a warning ahead of time.
Or just not warn them, let them try, and let them see what happens.