Trisa, Spiller of Blood

Whenever a creature attacks, each player
loses 1 life.
Fateful Hour — At the beginning of your
upkeep, if you have 5 or less life, for each
nonlegendary creature you control, create a
token that's a copy of it. Those tokens gain
haste. Exile those tokens at the beginning of
the next end step. Until end of turn, Trisa
gains "You can't lose the game."