Iron Mastiff - Commander Legends: Battle for Baldur's Gate

Whenever Iron Mastiff attacks, roll a d20 for each player being attacked and ignore all but the highest roll.
1-9 | Iron Mastiff deals damage equal to its power to you.
10-19 | Iron Mastiff deals damage equal to its power to defending player.
20 | Iron Mastiff deals damage equal to its power to each opponent.