Using tokens to damage opponents to steal an Instant or Sorcery and cast it for free is powerful but requires a ton of build-up
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Hope's effect turns that lifegain into mill, so even though you're not actively playing cards that mill, you're still making progress on draining your opponents of their libraries
But goes hard with Martyr of SandsMartyr of Sands
As for the ability to sacrifice it for an Eldrazi meh
Development playtests are much closer to what the players play and as such development wants to put it through realistic playtests