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In that scenario, you probably imagined an opponent with 0 life, and you with some attacking creatures

They also won't trigger if a card on the battlefield transforms into a card with the legendary supertype, the artifact card type, or the Saga subtype

Legendary Creature - Rogue Devil Krav, the Unredeemed Partner with Regna, the Redeemer (When this creature enters, target player may put Regna into their hand from their library, then shuffle.) , Sacrifice X creatures: Target player draws X cards and gains X life

And if an opponent spends a removal spell on your planeswalker after you drew a card, that's a fine deal for you