In the beggining i used Teebo, but it made everything too random, because de key is the elder. If it was not stealthed, and the others were, i was lost. Chirpa is more consistent. The Z in chirpa is very important, as it mades full team assisting again and again. I have counted more than ten attacks in a row. And the Z y logray is valuable to. It gives 10% health in every critic, what mades my team rehealth every turn.
In heroic raids i cant use Logray yet because its only 5*. I use r2 instead (for its special of stealth) and i can do +3M in rancor. In Haat i dont use them togethe, because of chirpatine, but in P3 and P4 they can make a lot of damage. Dont use it P1 or 2