Blue Wave Dragon, Tetra-drive Dragon

(This ability is active if you have four or more damage):At the end of the battle that this unit attacked a vanguard, if it is the second battle of that turn, until end of turn, this unit gets ":[ 2 & Choose two Aqua Force from your hand, and discard them] At the end of the battle that your rear-guard attacks a vanguard, if it is the fourth battle of that turn, you may pay the cost. If you do, this unit." : 1 This unit gets +2000 until end of turn. /:Lord (If you have a unit without a same clan as this unit, this unit cannot attack)