Great Galactic Beast, Zeal (D-PV01/089EN) [D-PV01: History Collection]

[G Guardian]-Opponent Turn's Guard Step-[COST][Discard a card with [Heal] from hand], and call this card to your (GC) from face down. [AUTO]:When this unit is placed on (GC), [COST][Soul-Blast 1], choose one of your opponent's units, and it gets [Power] -5000 until end of that battle. If the number of cards in your damage zone is equal to or more than your opponent's, you may [Counter-Blast 1]. If you do, choose one of your vanguards, and it gets [Power] +5000 until end of turn.