Kanbei, Weapon Master

Ki Damage -Whenever Kanbei becomes blocked,
roll a d20.
1-9 | Kanbei gains first strike until end of turn.
10-19 | It deals damage equal to its power to
target creature blocking it and gains first strike
until end of turn.
20 | It gets +1/+0, deals damage equal to its
power to target creature blocking it and gains
first strike until end of turn.