An opponent is unable to block and kill creatures you control.
Steps
Activate Kiki-Jiki by tapping it, creating a token copy of Bloodthirster with haste.
At the beginning of your combat phase, Brudiclad triggers, creating a 2/1 Phyrexian Myr artifact creature token, then causing each token you control to become a copy of the Bloodthirster token.
Deal combat damage with a Bloodthirster token.
The Bloodthirster token triggers, causing you to untap it and to get an additional combat phase after this one.