Arcana Force XIV - Temperance (Starfoil) (BP01-EN151) - Battle Pack: Epic Dawn Unlimited

During either player's turn, you can discard this card to reduce the damage you take from a battle to 0. When this card is Summoned, toss a coin:
• Heads: Halve all Battle Damage you take.
• Tails: Halve all Battle Damage your opponent takes.