One of the most interesting compositions one can run is the Bio/Raynor Composition. This composition involves two main heroes (Bio and Raynor) to essentially take out Aeon and Daggoth relatively quickly. A typical Bio/Raynor composition may look something like this:
The reason this composition works is because Daggoth is such an important objective in this game that whoever has the buff is almost unkillable in teamfights. A Bio ult combined with a Raynor mark leads to Levi being taken down in about 5 seconds at level 11.