As long as there is a Location or another unit with “Cantina” in its name or game text in this arena, Doctor Mandible gets +20 speed.
When Doctor Mandible attacks a unit or is attacked by a unit, that unit gets Lucky 1 for that attack.
Keywords
Lucky
Lucky X: A cumulative, static ability that means, "Each time this unit attacks or is attacked, you may re-roll up to X of this unit's attack dice or have your opponent re-roll up to X attack dice against this unit." Both players can use Lucky effects according to the rules for POP chances. Lucky is used only once after all triggered re-roll effects resolve. You can't re-roll more dice than are rolled for the attack. You may choose to roll any number of dice up to the Lucky value.