When Michonne, Ruthless Survivor enters the battlefield, create two Walker tokens.
(They're 2/2 black Zombie creatures.)
As long as Michonne, Ruthless Survivor is equipped, she must be blocked if able.
Whenever Michonne, Ruthless Survivor and at least two Zombies attack, Michonne, Ruthless Survivor gains
indestructible (Effects that say "destroy" don't destroy that permanent. An indestructible creature can't be destroyed by damage.) until end of turn.