It uses -1/-1 counters both as a cost and as a resource
There are some parallels to various board games here
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Cards like Balduvian Frostwaker, a humble creature that slowly turned snow lands into attackers, and Martyr of Sands, a simple life-gain engine that rewarded little more than revealing cards from your hand, echoed the incremental, board-focused gameplay that defined early Magic
Sacrifice is as strong as it is because of the added value you get from so many sacrifice triggers
You can then use these new tokens to generate additional mana, and so on