I made a PHX3 exploding stalker for use with exterminating mingebags.
take the green rocket model that explodes, and attach a thruster on the back, and at the front one at the top and another at the side.
make a target finder anywhere on it and a beacon sensor on the very tip of the rocket.
make a gate-expression- -1,0,+1 and make four of them.
make a ranger on the tip of the beacon sensor, and a detonator on the side of the rocket.
wire the beacon sensor to the target finder, and three of the gates to the beacon sensor. have A on the gate be either X, Y, or Z. wire the B output of the Z gate to the thruster on the top, Y gate to the one on the side, and the X gate to the one on the back.
now, wire the ranger to the last gate, and the last gate to the detonator.
make sure you duplicate it and save it, then unfreeze it and watch it follow someone and blow up!