243a0200_ne_Arena_Strategy___Blue_is_Me__Advantages
[Name] Colossus [Disadvantages] Weak versus air and heavy units, needs strong resources to level and strong micro-ing. [Advantages] 
Great at killing marines and light units. Can walk over cliffs. Chibi-colossus has insane attack speed and damage. Does well against heroes with its Ragnarok beam.
Starcraft 2: Marine Arena Strategy | Blue is Me
Advantages