传奇神器 ~武具
在你回合的战斗开始时,佩带此武具的生物或一个由你操控且名称为威可那的生物得+X/+X直到回合结束,X为你手牌的数量。
佩带~你每有一张手牌,便支付1点生命。
佩带

If you control both Vecna and Hand of Vecna equipped to another creature, you choose which creature to apply the bonus to as the triggered ability resolves.
Hand of Vecna's triggered ability uses the number of cards in your hand as it resolves to determine the bonus the creature gets. It won't change if the number of cards in your hand changes later in the turn.