Darksteel Angel 
Artifact Creature — Angel
Flying, indestructible
You can't lose the game and your opponents can't win the game.
Creatures you control can't have -1/-1 counters put on them.
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Cards that do something similar expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Herald of Eternal Dawn 100%
$1.08#4343
"You can't lose the game and your opponents can't win the game."
Melira, Sylvok Outcast 100%
$5.13#10980
"Creatures you control can't have -1/-1 counters put on them."
Lethal Sting 85%
$0.16#18099
"As an additional cost to cast this spell, put a -1/-1 counter on a creature you control."
Scarscale Ritual 85%
$0.13#24099
"As an additional cost to cast this spell, put a -1/-1 counter on a creature you control."
Spitting Dilophosaurus 84%
$30.63#5466
"Creatures your opponents control with -1/-1 counters on them can't block."
Liliana's Influence 83%
$0.35#14144
"Put a -1/-1 counter on each creature you don't control. You may search your library and/or graveyard for a card named Liliana, Death Wielder, reveal it, and put it into your hand. If you search your library this way, shuffle."