Mizuki, Former Agent

Lifelink, Haste

{1}, {t}: Each player rolls a d20. The player with the
highest result gains life equal to the amount of players, then
repeat this process for each player with a descending
result, but subtract the amount of life they would gain for
each player with a higher result than them.

Ultimate — Remove 12 charge counters from Mizuki:
Until end of turn, prevent the next X damage that will be
dealt to you, where X is your life total.