Originally Posted by
Mr. Safety
What would you cut? Leyline shuts off discard and edicts, but we already have reliable ways to deal with that. Discard slows us down, but our lands can't be discarded, one of the decks strengths along with the combo being safe from countermagic.
The eternal problem of Leylines, especially in a combo deck, is that it forces you to mulligan aggressively. Are you basically looking at Storm? I've been sideboarding a couple of Collective Brutality as additional discard/removal against Miracles, Grixis Control, and Grixis Delver. That works just fine against Storm as well, getting discard up to 9-10 slots. That's a really decent plan against Storm already. I don't think Leylines are necessary. Burn is a favorable matchup already, so Leyline doesn't really warrant slots there either.
So besides Storm, why Leyline of Sanctity?