Whenever one or more creatures a player controls deal combat damage to you, that player takes the initiative
You can't count on the Archangel actually connecting with lifelink through combat as she's one of the only targets for the removal spells your opponent has had in their hand all game

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As if thats not enough, Yuna also makes it so your other creatures can inherit the counters of their fallen friends instead of them fizzling when they hit the graveyard