Syr Gwyn, Hero of Ashvale
Vigilance, menace Whenever an equipped creature you control attacks, you draw a card and you lose 1 life. Equipment you control have equip Knight {0}.
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Official rulings (4) · Scryfall
If Syr Gwyn leaves the battlefield after an equip Knight ability has been activated, that ability still resolves even though the Equipment has lost that ability.
Syr Gwyn's triggered ability triggers once per attacking creature that's equipped, regardless of how many Equipment those creatures each carry.
Whether the target creature is a Knight is checked only as the equip Knight ability is activated and as that ability resolves. If the creature somehow becomes a non-Knight creature later, the Equipment remains attached to it.
Equipment you control still have their other equip abilities in addition to equip Knight {0}.