User blog comment:Leyrann/New Summoner Spell?/@comment-5266525-20120710100318

No. A summoner spell like this would offer absolutely NO counterplay whatsoever. When you have something in a game that literally has no counter, it is by definition broken. You can claim a one-per-game use is going to balance it but that's a superficial argument at best since a kill does not have the same value all game long. Summoner spells are simply not meant to be this gamechangingly powerful either, they are intended to supplement your champion's abilities.

The excuse that both teams can take it does NOT make it balanced, either. For both teams, it'll technically be balanced since they both have access to the same tools, but it'll be way beyond balanced compared to other summoner spells and indeed anything else in the game.