Generation Rules

Two required conditions for using g-guardian 

1. Both fighters are at grade 3 or greater.
2. You have a heal trigger in your hand.

Do take note of this for g-guardian

When you have 4 face up G guardian cards in your G zone, you cannot use G guardian in that fight.

How to use g-guardian

G guardians are placed face down in your G zone with the other G units, before the cardfight begins.

Steps

1. Your opponent’s unit attacks.
2. Put 1 heal trigger from your hand to drop zone as the cost.
3. Call a face down G guardian card from your G zone to the guardian circle at rest.
4. At the end of the battle, the G guardian is returned to G zone facing up.