Arcana Force XIV - Temperance [BP01-EN151] Starfoil Rare

During damage calculation, in either player's turn: You can discard this card; you take no Battle Damage from that battle. When this card is Summoned: Toss a coin and apply this effect. The effect lasts while this card is face-up on the field. •Heads: Halve all Battle Damage you take. •Tails: Halve all Battle Damage your opponent takes.