Boulder Axe Dragon, "Fugen" DZ-BT17/074 C

[AUTO]:When this unit is rode upon by a grade 3 with "Varga" in its card name, call this card to (RC), choose one of your vanguard's original [AUTO] abilities, and reduce its next Counter Blast cost you pay by (1) until end of turn. [AUTO](RC):When this unit attacks a vanguard, if you have a grade 3 or greater vanguard with "Varga" in its card name, until end of that battle, this unit gets [Power]+5000, at the end of that battle, retire this unit, and draw a card. (This effect is mandatory)