NEW GAME MODE IDEA

I have an idea for a cool gamemode. Its a 5v5 gamemode on Crystal Scar where both teams have a Z-z'Rot Portal, which can be placed anywhere (besides inside the fountain) on the map. Like Hide and Seek, the towers can't be captured. The objective of the game is to destroy the opponent's Z-z'Rot portal. As soon as the portal is destroyed, the team is not able to respawn anymore. Players are not allowed to buy anything except Tier 1 boots. Any suggestions?