Boulder Axe Dragon (D-PR/644EN) [D Promo Cards]

[AUTO]:When this unit is rode upon by a grade 3 card with "Varga" in its card name, call this card to (RC). [AUTO](RC):When this unit attacks a vanguard, if you have a grade 3 or greater vanguard with "Varga" in its card name, this unit gets [Power] +5000 until end of that battle, at the end of that battle, retire this unit, and draw a card. (This effect is mandatory)