Ancient Dragon, Tyrannolegend

(This ability is active if you have four or more damage):［Choose three of your rear-guards with "Ancient Dragon" in its card name, and retire them] When this unit attacks a vanguard, you may pay the cost. If you do, this unit gets +10000/ +1 until end of that battle. : 2-card with "Ancient Dragon" in its card name] This unit gets +5000 until end of turn. /:Lord (If you have a unit without a same clan as this unit, this unit cannot attack)