Flash [Balancing Concept]
This is going to separate Flash into on offensive spell and into another new spell for defense just like Zhonya's Ring being split into Hourglass for defense and Deathcap for offense. As everyone here should know by now, Flash has been the most dominant summoner spell since League's creation, so this spell can be safely deemed as very overpowered because of its ridiculous high pick rate.
Quick: This is Ghost renamed to Quick; completely unchanged to what it does now except for a name change, you will see why in a moment.
Ghost: Become transparent for 3 seconds. While transparent become untargetable and ignore all unit collision, abilities, and terrain. Cannot attack or use spells while transparent. 210 seconds cooldown.
This concept Ghost will be for the defensive portion of Flash for if you are needing an escape tool to stay alive. This is preferably for offensive roles like the Mage or Marksman to stay alive by using the transparency to de-aggro the enemy and try to run away, or use it to run through a wall in a sticky situation.
Flash: Quickly dash towards enemy champion within vision range. 210 seconds cooldown. 650 units range.
First off, Flash has been moved from being a blink/instant teleport to a dash. This allows for the spell to have an animation of where Flash is going to allow for better counter play and reaction from the opponent to properly adjust their gameplay to react to the enemy's play.
Another majour point is that this spell is no longer free cast and can only be used on enemy champions, {SEE EDIT} because Flash is now set to be offensive use only and for the better gameplay aspect with giving it a dash animation the cooldown and range can now be greatly buffed to what it currently is. [Even though I am pretty sure this is what Flash's cooldown and range used to be when it was first released.]
Thank-you for your time and have a nice day! ^.^ ~ Stacona
EDIT: Small change to Flash concept, it is now a [adjustable] skill shot that can only be cast within your champion's vision radius and only towards enemy champions, this will grant more freedom and flexibility than the point-and-click on enemy champion I originally had here, but to keep the spell as offense only and concept Ghost being the defensive only spell.