Enigman Zephyr

:Forerunner : 1 At the beginning of your attack step, you may pay the cost. If you do, return this unit to your hand. Burst-:When this unit is placed on , if your vanguard's is 10000 or greater, this unit gets +4000 until end of turn. If your vanguard's is 30000 or greater, choose one of your vanguards, and it gets +4000 until end of turn.