Heavenly Shock of Distinction, Lagrele (D-BT03/007EN) [Advance of Intertwined Stars]

[AUTO](RC):When this unit attacks a vanguard, [COST][Counter-Blast 2] & Rest] any number of your other rear-guards], and until end of that battle, this unit performs drive checks, and gets [Power] +5000. At the end of that battle, if you [Rest] three or less units for this cost, choose three cards from your hand, discard them, and if you [Rest] one or less units for this cost, choose two cards from your hand, and discard them. (Drive checks occur after guardians may be called)