You can then have Brinelin bounce them repeatedly with their cast trigger for a constant stream of removal
Of course things change

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Next, at the end of your turn if a player controls no creatures (presumably because you've forced them to exile them all), you have to sacrifice this enchantment
This more than makes up for the big weakness of Tombstone Stairwell: its cumulative upkeep cost
However, if they get unlucky enough to land on tails twice, all they get to do the next turn is draw a card before the turn comes back to you