Rough Game Mode Concept - What Do You Think?

Hey guys! Okay so bear with me here._.

What would you guys think of a game mode where:

• The map had two teams with one lane and was surrounded by jungle with monster camps.
• You have a draft ban of three champions before you pick THREE champions to play.
• When one champion of yours dies, it becomes substituted with the next champion on your list. This champion is the same level as the previous champion and has the same spending gold as what the previous champion made.
• The jungle holds objectives that appear at certain times. These objectives are to be fought over by both teams and can grant bonuses that are temporary but extremely useful.
• Similarly, if an objective is not completed within a certain time, both enemies may suffer negative consequences.
• There is no nexus for each team but a large monster instead. Objective types may vary but some may affect this creature. Killing the enemy teams large monster wins the game for that team.

This was a rough concept, I'm just as keen to see what you guys can come up with! So,what do you think? Thoughts? Comments?