Regonals in <12 Hours Sideboarding and Mana

Well I'll be (re)sleeving my deck soon. Looking to do well tomorrow. I'd love to Q for Nationals but the main reason I want to do well is so people see my decklist. Why do I want this? The awesome (random looking) sideboard.

3 Razormane Masticore
3 Damnation
2 Nameless Inversion
2 Thoughtseize
2 Persuasion
1 Mindspring
2 Counterbore

0 4x spells and three spells no other fae lists are running, whats not to like? Now to be fair Nameless is Terror 5 & 6, and the other two Thoughtseizes are in the maindeck. 3/3 on Damnation and Razormane is pretty typical so I won't comment on it.

Persuasion - Elf decks hold back a Colossus to play post Damnation. This means that you can tap out again the next turn and laugh all the way to your win.
Mindspring - For the mirror mostly. Most mirror games post sideboard go fairly long unless one player gets a quick Bitterblossom edge. It also is not hard to tap your opponent out at the end of his turn with a bunch of instants. Its okay to throw away some good spells getting him tapped out. You untap draw 4+ cards and then go on to win.
Counterbore - The latest versions of Revillark preform better versus fae from what I've seen. Counterbore on Revillark or Body Double stops their combo cold. Also bringing it in helps as it gives you another counterspell to help beat theirs.

The only other thing I'm considering in the sideboard is one Mystical Teachings and one Counterbore. This gives you the virtual 2x Counterbore but the Teachings is more flexable and can be played in the mirror for instant speed card advantage.

The only thing left is deciding on my manabase.
As it stands now:
4 Underground River
4 Secluded Glen
4 River of Tears
4 Mutavault
4 Faerie Conclave
3 Island
2 Pendelhaven
1 Sunken Ruins

This is one more land and three fewer islands than the typical Faerie manabase. I'm considering cutting two Conclaves for an Island and second Sunken Ruins. Dunno probably won't decide till filling out my decklist tomorrow. Might also just cut one Conclave in favor of a Ruins. Islands help your turn one Ancestral but they hurt you versus Merfolk and for casting black spells. I personally am going to favor the Ruins.