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Your opponents must play on an axis where damage matters to them in terms of winning the game, and your lifegain abilities must, on a card-for-card basis, compare favorably against the opponent's nonrenewable damage sources

With the right deck, Herald of Secret Streams basically reads creatures you control are unblockable, and there are many different decks able to abuse that ability right now

It lets you cast creatures directly from the graveyard by exiling other cards, making it perfect with self-mill spells like Grisly Salvage or Satyr Wayfinder

One of these types was the Arena League promo cards

These cantrip-esque effects become card advantage in the long run