While out-of-combat, swap one of your equipped summoner spells to a new, single use summoner spell.
Your first swap becomes available at the 6 minute mark, with an initial 240 second cooldown. Selecting a summoner spell reduces the swap cooldown by 15 seconds, up to once per unique summoner spell, down to a minimum of 120 second cooldown. You must swap to 3 different summoner spells before returning to one you've already used.
Selecting a summoner spell puts it on a 5 second cooldown.
Using a selected summoner spell puts the summoner spell on the same slot on a 10 second cooldown.
Your original summoner spells continue cooling down in the background while swapped out.
You can now swap your summoner spells anywhere on the map as long as you're out of combat.
Closing the Unsealed Spellbook tab while dead no longer prevents you from re-opening it until respawn.
Old Effects:
Reduces the cooldown of summoner spells by 15%.
Additionally, you may swap your Summoner Spells while at the shop by exchanging Summoner Shards. You gain your first Summoner Shard at 2:00, and gain another every 6 minutes thereafter, up to a maximum of 2 at a time.
Newly acquired summoner spells will inherit any remaining cooldown of the summoner spell it is replacing.
Passive: Reduces the cooldown of summoner spells by 25%.
Additionally, you may swap your Summoner Spells while at the Shop by exchanging Summoner Shards. You gain your first Summoner Shard at 2:00, and gain another every 6 minutes thereafter, up to a maximum of 2 at a time.
Newly acquired summoner spells will inherit any remaining cooldown of the summoner spell it is replacing.
Swapping to Smite during a game will not grant access to Jungler items, and you may not have the same summoner spell twice.
Smite will not grant access to jungle-exclusive items such as 
Summoner's Rift
Barrier 
Cleanse 
Ignite
Exhaust 
Flash 
Ghost
Heal 
Clarity 
Smite
Teleport 
Howling Abyss
Mark
Precision
Domination
Sorcery
Resolve
Inspiration
Removed
