Protect the Master
Type: Ability
Faction: Neutral
Rules:
Ongoing: Each deck is also an ally with protector and 0 ATK / X , where X is the number of cards in that deck.

When a deck is dealt damage, put that many of its cards into its owner's graveyard, then remove that much damage from it.

A deck can't leave its owner's party.

Set: Arena Grand Melee (81)