
Enchantment
Whenever a creature an opponent controls becomes tapped, if it isn't being declared as an attacker, you may draw a card.
: Tap target creature without flying.
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→ Creatures opponents control do not untap, Tap all creatures opponents control, Lock
→ Tap all creatures opponents control during each turn
→ Tap all creatures opponents control during each turn
For Verity Circle's first ability to trigger, the creature has to actually change from untapped to tapped. If an effect attempts to tap a tapped creature, but it was already tapped at the time, the ability won't trigger.
If a creature enters the battlefield tapped, Verity Circle's first ability doesn't trigger.
If a creature with vigilance is declared as an attacker and then becomes tapped while it's attacking, Verity Circle's first ability triggers.