Unseal spell book should allow access to old/removed summoners spells eg. Surge...

For those who don't know, there are many summoner spell that have been removed in lol. It would be cool if unseal spellbook can grant the user access to them.

In addition, riot can also create some new spells that only work with the keystone.

Spells removed from game...

Surge Empowers your champion, increasing ability power by 10 - 78 (based on level) and attack speed by 35% for 12 seconds.

Stifle Silences a target enemy champion for 3 seconds, and removes any beneficial buffs they have.

Revive Instantly revives your champion at your team's Summoner Platform and grants 125% movement speed increase which decays over 12 seconds.

Rally Summons a beacon with 225 - 650 (based on level) health for 15 seconds which increases allied attack damage by 10 – 35.

Promote (spell) Promotes the nearest allied Siege Minion (in Classic) or super minion (in Dominion) to an anti-Turret Cannon, healing it, granting bonus stats (depending on level), and causing it to grant the caster gold for its kills.

Fortify Grants invulnerability to all allied turrets and causes them to attack 100% faster for 7 seconds. While Fortify is ready to cast, you deal 9 bonus damage to minions.

Clairvoyance Reveals a small area of the map for your team for 5 seconds.

All these spell can be found at http://leagueoflegends.wikia.com/wiki/Summoner_spell