Sandworm with Vex behavior pattern

Hi, I'm trying to figure out how to implement the behavior of a mob so that it can pass through blocks of sand and, as it were, “emerge” from the sand and attack the player. I would like to pay special attention to the behavior of the mob; it is important that the mob cannot simply fly in the air forever, but that it only jumps out of the sand during an attack

P.s.  I thought about the idea of making the mob simply invisible and leaving only special particles or changing its texture, but this is more like a replacement for an adequate solution due to the inability to find one