Mono W Lifegain Deck - sideboard ideas?

[BobaFettuccini]

I'm a recent Magic convert. A classmate got me into it back in March, took me to a card shop and got me started with an M12 starter deck. I built on the green/white approach, but a coworker showed me how I had too many differing strategies running in the same deck, so I opted to Purge the green and run it as a mono white life gain.

It's proven to be a pretty effective stall deck, and I have a few different win strategies that have saved me. My main concern is versatility - I can hold out against devour decks, burn decks, demon decks, bla bla bla, but I want to improve my sideboard so I can take on token decks, which seems to be my weakest point. I have this one coworker who uses a W/R human deck that pumps out and buffs scccoooorrres of 1/1 Humans and Human Soldiers, and there's nothing more obnoxious than being clobbered by 40+ tokens.

My Ex Said Get A Life
By: BobaFettuccini
Legacy
Archive: http://magic.tcgplayer.com/db/deck.asp?deck_id=1033675

Main Deck:
1 Ajani Goldmane
4 Ajani's Pridemate
2 Archon of Justice
1 Dawn Elemental
2 Felidar Sovereign
2 Nearheath Pilgrim
1 Purity
1 Serra Avatar
4 Soul Warden
4 Wall of Reverence

4 Faith's Fetters
2 Loxodon Warhammer
2 Oblivion Ring
2 Safe Passage
2 Spirit Mantle
2 Survival Cache
1 Sylvok Lifestaff

2 Emeria, the Sky Ruin
22 Plains

Sideboard:
2 Angel's Mercy
1 Day of Judgment
2 Divine Favor
4 Divine Offering
2 Gideon's Avenger
1 Pariah's Shield
1 Purity
2 Survival Cache

I'm planning on adding an Elspeth Tirel, but I already spent my weekly MTG allotment.

So, any pointers?

[Nick 30075]

Your best bet for dealing with tokens is probably Day of Judgment-esque effects.

Sunblast Angel and Planar Cleansing are rather inexpensive at the moment, though they're both inferior to Day of Judgment itself.

Do you have access to Serra Ascendant? It's one of the best cards for a lifegain deck ever printed. Felidar Sovereign works wonders as well.

[BobaFettuccini]

Sunblast Angel wouldn't work because so many of the tokens have Vigilance. Planar Cleansing is way too expensive manawise, so I guess I'll add a couple more Day of Judgement to the sideboard.

Also, didn't know about that Serra Ascendant, but that's awesome. I need a few more cheap drops for early game.