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If you control no tapped artifacts when the triggered ability resolves (perhaps because they were destroyed or had vigilance), no damage will be dealt and you won't scry

If you control two copies of Virtue of Knowledge, a permanent entering the battlefield causes abilities to trigger three times, not four

The untap is less useful still outside of Spliter Twin gimmicks

Chandra, Flame's Furys Shock is basically irrelevant by the time it comes down, and there are much better, cheaper Chandras that deal 4 damage to an opposing creature

Being able to take the fight to ready characters rather than just those exerted means that no opponents character is safe with the knight on the field

Kinnan, Bonder Prodigy