Ancient Dragon, Volcatops (RRR)

[ACT](VC) Limit Break 4 (This ability is active if you have four or more damage):[Counter Blast (1) & Choose one of your rear-guards with Ancient Dragon in its card name, and retire it] Choose up to two of your rear-guards with Ancient Dragon in its card name, and those units get [Power]+5000 until end of turn. This ability cannot be used for the rest of that turn.
[AUTO](VC):[Choose one of your rear-guards, and retire it] When this unit attacks a vanguard, you may pay the cost. If you do, this unit gets [Power]+5000 until end of that battle.