Battle of Attrition

When Battle of Attrition is on the board, the defending player gets +1 Toughness while the attacking player gets -1 Power.
Battle of Attrition can be ended through a dice
roll. If a player taps two mana, Battle of Attrition
will have a 33% chance of ending.
However, Battle of Attrition must remain on the
field until the caster's next turn.