Rakdos Charm
Artist: Zoltan Boros TCG Player Link Scryfall Link EDHREC Link
seen from Canada
seen from Canada
seen from Australia
seen from Brazil
seen from United States
seen from United Kingdom

seen from Australia
seen from Canada
seen from United States
seen from Malaysia

seen from Canada
seen from Australia

seen from Germany

seen from Canada
seen from United Kingdom
seen from Canada
seen from Russia

seen from Germany
seen from Türkiye

seen from United States
Rakdos Charm
Artist: Zoltan Boros TCG Player Link Scryfall Link EDHREC Link
If my opponent has more than 1 creature will Ob Nixilis, Captive Kingpin trigger multiple times or just once with rakdos charm’s last ability to have each creature deal 1 damage to its controller?
Whenever damage is going to be dealt, it goes through a multi-step process to determine the results. If there are no keywords or replacement effects that modify the effects or amount of the damage, then the result will be damage being marked on a creature, counters being removed from a battle or planeswalker, or a player losing life.
In the case of Rakdos Charm's third mode, we have one damage event where each creature deals 1 damage to its controller. (This is a single damage event because because the verb "deals" is only used once.) Assuming no replacement effects or keywords modifying the effect of the damage, then the result will be each player losing an amount of life equal to the number of creatures they control.
Since your opponent controls more than one creature, they're losing more than 1 life and so Ob's ability doesn't trigger at all here.
Rakdos Charm
Artist: Zoltan Boros TCG Player Link Scryfall Link EDHREC Link
Rakdos Charm
Artist: Zoltan Boros TCG Player Link Scryfall Link EDHREC Link
Rakdos Charm
Artist: Zoltan Boros
UTILITY PAIN Rakdos Charm is, in my opinion, the most useful of the Ravnica charms. Each of its options can come into play, exile a graveyard in response to retrieval (Eternal Witness, Mystic Retrieval, Obzedat's Aid). Bust an Akroma's Memorial (Rakdos's bane), Lightning Greaves, or Skullclamp. Or punish a token deck, Selesnya, Zombie tribal, a recently played Storm Herd. In EDH its likely the field will be loaded with tokens or god forbid an infinite Kiki Jiki combo, at instant speed Rakdos Charm could easily become your best friend.