I think the Counter Blast(x) - "something" means you can only flip cards of that type to pay for the Counter Blast.
Continuous [V]: Your units cannot boost this unit.
Auto [V]: [Counter Blast(2) - <Royal Paladin>] When this unit attacks a vanguard, you may pay the cost. If you do, until end of the battle, increase this unit's power, the power increased is the total original power of your front row <Royal Paladin> rear-guards.
Auto [V]: When this unit attacks a vanguard, this unit gets power +3000 until end of battle.
Claudia (Vanguard 0)
Auto: Pioneer (When another card with the same clan rides this unit, you may call this unit to a rear-guard circle.
Activate [R]: [Put this unit into soul] Choose one of your <Royal Paladin>, it gets power +3000 until end of turn.