[Tower Idea] Assassin.

Assassin Metropolis drop Male Normal tower (white gem) Attack 4-16 (you decide I'm not really good at this) 2 or 3 range (your call) Effect: Bloody knives: the target receives a 30% of bleed damage and enemies in 1 range receive 10% of splash damage. +5% every 19 levels.

This sounds like the Frog + Dandelion. I like the idea of a bleed effect though.