You may put a creature card with mana value 4 or less from among them onto the battlefield
For just one mana, one creature phases out, effectively making them not part of the game until your next turn
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Other times, it's a key error with a card's casting cost
The Dispute costs one more than Village Rites, you can sac a dork or artifact including tokens like Treasures or artifacts like Ichor Wellspring and you'll get a free Treasure for ramping and this really just leaves you down a mana