Blue Storm Dragon, Maelstrom (BT08/S05EN) [Blue Storm Armada]

[AUTO](VC)[Limit-Break 4](This ability is active if you have four or more damage):When this unit attacks a vanguard, if it is the fourth battle of that turn or more, until end of that battle, this unit gets [Power] +5000 and "[AUTO](VC):[Counter-Blast 1] When this unit's attack hits, you may pay the cost. If you do, draw a card, choose one of your opponent's rear-guards, and retire it.". [CONT](VC/RC):If you have a non- vanguard or rear-guard, this unit gets [Power] -2000.