Trinity of Us

Trinity of Us enters the battlefield with three vow counters on it.
At the beginning of your upkeep, remove a vow counter. You gain 3 life. Then, if you control Sunset Sovereigns, scry 3 and creatures you control get +3/+0 until the end of turn.
When the last vow counter is removed, draw 3 cards.

"Three Years, Two People, One Story."