SCG LA Top 8 with RUG Delver

[Ziveeman]

Here's the link: http://www.azmagicplayers.com/articles/delving-again-at-scg-la-top-8/

For those who don't want to read, here's the Cliffs Notes:

Round 1 - UW Stoneblade/Miracles - 2-1
Round 2 - Belcher - 2-0
Round 3 - Goblins - 2-1
Round 4 - UB Delver/Death's Shadow - 2-1
Round 5 - Merfolk - 2-0
Round 6 - Goblins - 2-0
Round 7 - Maverick - 2-0 (scooped since I was paired down to a friend)
Round 8 - Miracles - ID
Round 9 - Maverick - ID
Top 8 - Merfolk - 0-2

Aaand decklist:

Creatures (14)
4 Delver of Secrets
4 Nimble Mongoose
3 Tarmogoyf
2 Grim Lavamancer
1 Scavenging Ooze

Spells (28)
4 Brainstorm
4 Ponder
2 Thought Scour
4 Force of Will
3 Daze
3 Spell Pierce
4 Stifle
4 Lightning Bolt

Lands (18)
4 Wooded Foothills
4 Polluted Delta
3 Tropical Island
3 Volcanic Island
4 Wasteland

Sideboard (15)
4 Submerge
2 Red Elemental Blast
2 Ancient Grudge
2 Tormod's Crypt
1 Grafdigger's Cage
1 Rough // Tumble
1 Gilded Drake
1 Flusterstorm
1 Life from the Loam

[dsck]

I dont understand why people @ scg events play grim lavamancers in their thresh decks with mongooses when they could play this list http://thecouncil.es/tcdecks/deck.php?id=8341&iddeck=60776