Preacher of the Schism

Deathtouch
Whenever this creature attacks the player with the most life or tied for most life, create a 1/1 white Vampire creature token with lifelink.
Whenever this creature attacks while you have the most life or are tied for most life, you draw a card and you lose 1 life.

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The Lost Caverns of Ixalan

Deathtouch
Whenever Preacher of the Schism attacks the player with the most life or tied for most life, create a 1/1 white Vampire creature token with lifelink.
Whenever Preacher of the Schism attacks while you have the most life or are tied for most life, you draw a card and you lose 1 life.

If you are tied for most life and Preacher of the Schism attacks another player who is tied for most life, both its middle and its last ability will trigger.

Once Preacher of the Schism's middle ability triggers, it doesn't matter what happens to players' life totals before the ability resolves. You'll create a Vampire token even if the player Preacher of the Schism attacked doesn't have the most life as the ability resolves.

Preacher of the Schism's middle ability triggers only if it attacks a player. It won't trigger if Preacher of the Schism attacks a planeswalker or battle, no matter what its controller's life total is.

Similarly, once Preacher of the Schism's last ability triggers, it doesn't matter what happens to players' life totals before the ability resolves. You'll draw a card and lose 1 life even if you don't have the most life as the ability resolves.