For centuries, people has been asking what is my BG like. Here is is: https://poxbase.com/deck/ClCj0CxCiOCdACy1CwNCyZs2vs6qsys4Ws4@s7Fs2lsOs1As8@r3TE1+e2K Feel free to criticise.
In case of Bloodtracker, which is quite similar to other damage-on-deploy abbilities, you do this: take your weakest champ, then move him closer to the closest deployment zone. In case of Bloodied, things gets a little bit difficult, but usually, it all involved killing the Bleeding champ before he plays Blood Magic. If you suspect your player is going to use Rain of Blood, you simply keep your strengh as spread as possible. It works the same with normal damage AoE when using Murk.