Whale of a Tale (SBC1-ENS03) - Speed Duel: Streets of Battle City 1st Edition

Discard 1 card from your hand and add 1 "Fortress Whale" or "Fortress Whale's Oath" from your Deck to your hand. "Fortress Whale" monsters you control gain the following effect:
• Your opponent cannot target face-up WATER monsters you control with Spell/Trap cards or effects.