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Gryff's Boon and Spirit Mantle make sure that once we build a lethal threat, it actually gets to hit our opponent and end the game
This also lets you crack open a booster and cast those spells this turn, but that is a may effect and could draw you some nice card advantage in mana ramping form
Thats a total of four token copies entering play, triggering whatever enter the battlefield trigger they have, and tapped and attacking for extra damage
However, aside from having the Merfolk creature type, this card doesn't do anything inherently useful for the faction unless you're leaning into the +1/+1 counter theme
(2020-08-07) If the defending player reveals a nonland card, it remains on top of their library