At ground level, place your 3x3 sticky pistons. On top of each piston, place a Slime Block (this prevents the mob from glitching out of the trap). On top of the slime block, place your decorative floor (Orange Wool/Carpet).
To survive, you need automation. You need redstone ingenuity. You need the has to offer. lovely craft piston trap halloween update best
You build a circular arena (8x8). In the center, you place a vertical column of pistons that spin. On the outer ring, you place Soul Sand . The Halloween update made Soul Sand "slippery" for mobs. They walk onto it and slide toward the center. The rotating piston arm sweeps the arena every 4 seconds, pushing all mobs into a central pit of lava covered by a false piston floor. At ground level, place your 3x3 sticky pistons