Collision, tags, and triggers

#pragma strict

var Damage = 1000;

function OnTriggerEnter (col : Collision) {
	var Script : HealthMUTO = GameObject.Find("Muto").GetComponent(HealthMUTO);
	if (col.tag == "MUTO")
		Script.Health -= Damage;

I’m making a Godzilla game, and that is for the fire or the punch on the MUTO. But I’m getting an error that says that “tag” isn’t a member of “UnityEngine.Collision”. I don’t quite understand, since I’ve worked with this before, but the assets of that project got corrupted.

col should be a Collider, not a Collision.