If you only have grind, then you know the number of times it takes to mill someone out is directly tied to the number of lands left in his or her library, which can mostly be figured out by counting the lands on the battlefield
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In some metagames, going slightly bigger could be preferable
Surge's Strategy to play multiple copies of cards like Delinquent that would remove every card from their opponent's hand
If creatures are that much more valuable than spells in your list then these are pretty good options
Next would be Priest of Forgotten Gods