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Valakut
A Standard deck, by Toni Ramis
2nd place at a tournament in Barcelona, Spain on 2011-03-27
As reported at http://www.wizards.com/magic/magazine/article.aspx?x=mtg/daily/eventcoverage/gpbar11/welcome#1

Maindeck:
5 Forest
11 Mountain

Creatures
3 Inferno Titan (Not currently legal in Standard)
4 Lotus Cobra
4 Overgrown Battlement (Not currently legal in Standard)
4 Primeval Titan (Not currently legal in Standard)

Enchantments
3 Khalni Heart Expedition (Not currently legal in Standard)

Instants
4 Harrow (Not currently legal in Standard)
4 Summoning Trap (Not currently legal in Standard)

Sorceries
4 Explore (Not currently legal in Standard)
2 Green Sun's Zenith (Not currently legal in Standard)

Lands
1 Evolving Wilds
1 Khalni Garden (Not currently legal in Standard)
3 Misty Rainforest (Not currently legal in Standard)
3 Terramorphic Expanse (Not currently legal in Standard)
4 Valakut, the Molten Pinnacle (Not currently legal in Standard)

Sideboard:
2 Acidic Slime (Not currently legal in Standard)
3 Obstinate Baloth (Not currently legal in Standard)
3 Nature's Claim (Not currently legal in Standard)
2 Act of Treason (Not currently legal in Standard)
1 Green Sun's Zenith (Not currently legal in Standard)
4 Pyroclasm (Not currently legal in Standard)