[quote=@The Grey Dust]
Seems fine, although the idea with having exactly 1,3,5, and 7 was to make it more niche as they skipped the evens, the ranges make it more playable. Also I think you're using "it's" rather than "its" which is incorrect in the wording, although we know what you mean.

[hider=proposed Custom SD decklist][b]Custom Structure Deck List:[/b]

[i]Library of Learning.[/i]

Monsters: 15
1 x Fool of Prophecy
1 x Spellbook Magician of Prophecy
1 x High Priestess of Prophecy 
1 x Charioteer of Prophecy
1 x Hermit of Prophecy
1 x Wheel of Prophecy
1 x Justice of Prophecy
1 x Reaper of Prophecy
1 x Temperance of Prophecy
1 x Prophecy Destroyer
1 x World of Prophecy
1 x The Staff of Prophecy
1 x The Ring of Prophecy
1 x The Vessel of Prophecy 
1 x The Blade of Prophecy



Spells 15
2 x Spellbook of Secrets
1 x Spellbook of The Master
1 x Spellbook of Eternity
1 x Spellbook of Fate
2 x Spellbook of Resonance
2 x Spellbook of Wisdom
2 x Spellbook of Equilibrium
1 x Spellbook of Hope
1 x Spellbook of Life
1 x Spellbook of Power
1 x Grand Spellbook Tower

Traps 10
(gm's choice)

Extra 5
1 x Hierophant of Prophecy
1 x Empress of Prophecy
1 x Alchemic Magician
1 x Downerd Magician
1 x Slacker Magician

[/hider]
[/quote]

Get rid of a few Prophecy cards and replace them with more generic ones, you've got the whole damn set in there! I pulled this kind of Bullshit before and got through with it somehow, but I'm not letting others do the same. Same with some of the spellbooks. I suggest removing the more powerful, staple cards and leaving the more niche ones. Also get rid of one of the magicians or Empress of Prophecy.

If you've made those changes, post your next version again.