Three Strikes Barrier (MP18-EN079) - 2018 Mega-Tins Mega Pack 1st Edition

If your opponent controls exactly 3 cards: Activate 1 of these effects;
• this turn, your monsters cannot be destroyed by battle.
• this turn, you take no battle damage.
• this turn, each time your monster inflicts battle damage to your opponent, you gain the same amount of LP.