“Summer 2013” experimental season. Online ranked games (reports, discussions).

Come on... in Heroes of Might and Magic, there are usually 6-7 of them, which is 30-35 SP. And they have a lot of hit points. And good speed. Out of all possible joins, this is the most successful one, in my opinion.

7 dragons will deal 895 damage with a lightning strike. Is that a lot? For Anarchy, where there can be stacks of 100+ wyverns, it's nothing at all.
In my opinion, the most successful join is a Haven from a non-upgraded level 7 creature, for example, 35 bears or giants, which can be upgraded, or 25 angels...