Dies to Removal

Here is a deck that has some results on mtgo. Curious why it doesnt run Tarmogoyf. Thoughts?

[deck]4 Arid Mesa
1 Breeding Pool
1 Hallowed Fountain
1 Island
4 Misty Rainforest
1 Plains
2 Sacred Foundry
4 Scalding Tarn
2 Steam Vents
1 Stomping Ground

4 Delver of Secrets
4 Geist of Saint Traft
2 Grim Lavamancer
4 Snapcaster Mage
4 Wild Nacatl

4 Lightning Bolt
4 Lightning Helix
3 Mana Leak
4 Path to Exile
4 Serum Visions
2 Spell Snare

Sideboard
1 Ancient Grudge
2 Counterflux
1 Dispel
1 Engineered Explosives
1 Grim Lavamancer
4 Mirran Crusader
2 Relic of Progenitus
2 Spell Pierce
1 Wear // Tear
15 sideboard cards[/deck]

As some of you might remembered I tested Delver + Nacatl combo before and was impresed with them, couldnt play them on mtgo as I didnt have goyfs out there. I aw that this deck doesnt even run Goyfs, we however see
lavamancers and geists here. Thoughts?

I think it must be budget constraint or the need to play more then 1 spell per turn.

I'm also a huge fan of URx tempo builds in Modern my ONLY complaint is that I couldn't beat Jund or Junk at all.... (that said since DrS is banned it should be easier).

It looks like Tribal Zoo without Tribal Flames or the fifth color. Seems suboptimal.

Didnt tribal zoo also run Goyfs?

Also isnt remand good in a tempo shell? Land cheap threat in delver, nacatl or goyf and protect it?

I dont know if Geist is good in either combo metagame (where tapping out on turn 3 sometimes means gg) or in grindy metagame (where geist is killed with anything that can block it).