Great Galactic Beast, Zeal (G-EB03/031EN) (G-EB03)

[G guardian] (Usable when both fighters' vanguards are grade 3 or greater, and the number of face up G guardians in your G zone is three or less)-Opponent Turn's Guard Step-[Choose a card with "Heal" from your hand, and discard it] Call this card to your (GC) from face down.
[AUTO]:[Soul Blast (1)] When this unit is placed on (GC), you may pay the cost. If you do, choose one of your opponent's unit, and it gets [Power]-5000 until end of that battle. If the number of cards in your damage zone is greater than or equal to the number of cards in your opponent's damage zone, you may Counter Blast (1). If you do that, choose one of your vanguards, and it gets [Power]+5000 until end of turn.