Blue Storm Wave Dragon, Tetra-burst Dragon

:[Legion 20000]"Blue Storm Marine General, Starless"(If your opponent's vanguard is grade 3 or greater, this unit may return four cards from your drop zone into your deck once, search your deck for the specified card, and Legion) : 1 When this unit attacks a vanguard, if this unit is [Legion], and if it is the fourth battle of that turn or more, you may pay the cost. If you do, this unit gets +5000/ +1 until end of that battle. :When this unit attacks a vanguard, if you have another unit in your middle column, this unit gets +3000 until end of that battle.