[SUGGESTION] NEW SUMMONER SPELL: Dummy/Decoy
I think this may have been mentioned in some Rito pls message about lack of variance in summoner spells, but I would love to see a mechanic like this and its interaction with all champions.
The Dummy is a spell that spawns a stationary white peg-shaped mannequin which can be targeted by all champions.
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You may not auto attack it (neither can turrets), you can only use spells and it dies after the first hit/complete interaction, melting in its resting place afterwards. Skills that apply on hit effects that are not autoattack modifiers will work on this. For instance,
Irelia's Q will work but 
Hecarim's E will not. -
Its interaction behaviors mimic that of a stationary champion, but some of its interactions are more like a minion or ward in terms of how you would use it.
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The dummy provides a 500 diameter vision circle that does not go over walls so long as its owner is within 400 range of it, which is also its max cast range.
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Does not affect unit collision, and gets brushed aside by player made terrain.
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Cooldown is 250-300 seconds.
I think this would add unseen depth to gameplay. A lot of champions have good interactions with units that allow them to start fights, run, chase, and other utilities. I think this would make it more apparent and enhance those strengths.
Feel free to critique, discuss and bury this topic as you please. I just wanted to put this idea out there the best I could, sorry if this comes up a lot.
That was originally posted on Reddit. Here, on LoL boards I would like to extend this topic and list champions here that would benefit from having this as an option, much like some champions rely on flash, ignite or ghost, exhaust and teleport to make their signature plays.
But this one is purely a skill based utility spell. Of course some champs like Udyr wouldn't use it, but with as many champions as this game has it should at the very least be an option that could potentially see pro play if people come to understand its power in utility.
The champions who would most benefit from that over taking regular summoner spells are as follow (and it's up to you to imagine the uses here, varying from wall jumps to full on engages):
That's just the list of champions who can use it for themselves in mobility, defensive, and offensive behaviors with their skills. It can also provide as counterplay to other champions in terms of defense, such as blocking Cait's ult, Jhin's last shot or Sion's ult.