:When this unit is rode upon by a unit with "Silver Thorn" in its card name, Counter Charge (1).
:When this unit is placed on from soul by the ability of your vanguard with "Silver Thorn" in its card name, if you did not Counter Charge this turn, COST [put this unit and another rear-guard with "Silver Thorn" in its card name into your soul], and Counter Charge (1).