2020-06-23 : If a creature didn't die before your end step begins, the last ability of Liliana's Devotee doesn't trigger at all. The creature may have died before Liliana's Devotee entered the battlefield, however.

2020-06-23 : The triggered ability triggers just once, no matter how many creatures died this turn.

2020-06-23 : While resolving the triggered ability, you can't pay more than {1}{B} to get more than one Zombie token.