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I don't know if I necessarily agree with your assessment of Ad Nauseum. Ad Nauseum seems to trump Stifle by letting you draw into more discard, and seems to trump discard as you just build up...

So you'd go:

Turn 1: Land, Top.
Turn 2: Mystical on upkeep for Doomsday, draw into it. Play the second land, LED, Ritual, Doomsday (for Infernal Contract, Petal, Ritual, LED, Tendrils). Activate...

What's the best strategy for winning the mirror? Orim's Chant appears to be the key; ideally, it seems that you want to Chant them before going off in order to prevent them from Chanting you...

First of all, going off with Slithermuse on turn 1 is extremely unlikely. You need either land + Petal + Petal + Petal/Ritual + Slithermuse or land + Ritual + Infernal + LED. The first possibility is...

What are people's sideboards looking like? It seems like there are currently 4 basic categories of cards in the board:

Wish targets (Tendrils/EtW, Extirpate, Chant, Mage/Teeg removal)
Bounce...

What's the logic behind moving Confidant to the board? Do you bring it in games 2 and 3 after people have sided out removal?