An arcade style game mode?

With the arcade line of skins growing why not introduce a sort of Arcade Boss game mode. Something like a cross between Doom bots and Ascension? Or the new bloom Year Beast event from dota is more accurate to what im trying to describe if anyone would be familiar with it (if not, youtube it). Maybe you being on a small 3-5 cell team versus one huge empowered champion (final boss) either player controlled or bot adjusted to be able to withstand an onslaught from an entire team, such as how the final boss Veigar teaser video was conducted. You only get a limited amount of lives (respawns) and a set time limit, and your opponent is just in a super powerful boss state while your team is relatively weaker requiring coordination and turtling to survive and defeat the designated Arcade boss.

As i mentioned the closest most accurate pre-existing example of what im thinking of is the Year Beast event mode from Dota 2. I mean you can chew the idea up alot more than this of course but im just discussing the idea in its base form :3 But I'd like to hear what anyone has to say.