Kiyomaro, First to Stand

Kiyomaro's power and toughness are each equal to the number of cards in your hand.
As long as you have four or more cards in hand, Kiyomaro has vigilance.
Whenever Kiyomaro deals damage, if you have seven or more cards in hand, you gain 7 life.

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Saviors of Kamigawa

Kiyomaro, First to Stand's power and toughness are each equal to the number of cards in your hand.
As long as you have four or more cards in hand, Kiyomaro has vigilance.
Whenever Kiyomaro deals damage, if you have seven or more cards in hand, you gain 7 life.

Saviors of Kamigawa Promos

If you have seven or more cards in hand when Kiyomaro's triggered ability goes on the stack but less than seven when the ability resolves, the ability does nothing.

Kiyomaro's power and toughness don't affect whether it has vigilance or the life-gain ability.

Losing vigilance after attackers are declared doesn't cause Kiyomaro to tap.