Does Torpor Orb prevent triggered abilities from spells, or only from permanents entering the battlefield?

Torpor Orb reads: 'Creatures entering the battlefield don't cause abilities to trigger.' This suppresses only triggered abilities that use the condition 'when/whenever [a creature] enters the battlefield' as their trigger event — and only those triggered abilities that are caused by a creature permanent entering the battlefield.

Spells being cast are a separate game event from a permanent entering the battlefield (CR 601.2, 305.1). A spell like Cloudshift creates a 'when this creature enters the battlefield' trigger on the permanent after it resolves, which Torpor Orb would suppress. However, if a spell itself has a triggered ability that triggers upon being cast (an 'when you cast' trigger), Torpor Orb does not interfere with that, because casting is not the same event as entering the battlefield.

Torpor Orb also does not stop triggered abilities on non-creature permanents entering the battlefield — it is specifically limited to creatures (CR 603.6 covers how replacement and prevention effects interact with triggers). Non-creature permanents like artifacts or enchantments entering the battlefield still trigger their normal abilities even under Torpor Orb.

Concrete example: You cast Restoration Angel, which blinks a creature. When that creature re-enters the battlefield, Torpor Orb suppresses its 'enters the battlefield' triggered ability. However, if you have a Panharmonicon on the field, the Torpor Orb still suppresses the creature's ETB — Panharmonicon cannot double a trigger that was already prevented from occurring.

In summary, Torpor Orb is narrowly focused on creature ETB triggers. Spell-cast triggers, non-creature ETB triggers, and all other trigger types are unaffected by it (CR 603.1, 603.6).