Cycling is an activated ability. Effects that interact with activated abilities (such as Stifle or Rings of Brighthearth) will interact with cycling. Effects that interact with spells (such as Remove Soul or Faerie Tauntings) will not.

Sicken : règles, fonctionnement et interactions (MTG)

Sicken is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Enchant creature Enchanted creature gets -1/-1. Cycling (, Discard this card: Draw a card.)

How it works : Sicken

Original English text — Wizards of the Coast / Scryfall

#1October 1, 2008· Wizards of the Coast
Cycling is an activated ability. Effects that interact with activated abilities (such as Stifle or Rings of Brighthearth) will interact with cycling. Effects that interact with spells (such as Remove Soul or Faerie Tauntings) will not.
No other card is named in this ruling.