Time for some powerplay then.
Mishra's Workshop, Sundering Titan, destoying one of your mountains and islands. Done (If you don't have a thwart that is

).
Modus Pwnens: 20
Hand: 1
Library: 30
Play:
(T, T) Island
(T) Mountain
(T) Desert (T: 1. T: ~ deals 1 damage to target attacking creature. Play this ability only during the end of combat step)
(T) Mutavault (T: 1. 1: ~ becomes a 2/2 creature with all creature types until end of turn. It's still a land)
(T) Mishra's Workshop (T: 3, use this mana only to play artifact spells and activated abilities of artifacts)
(U) Goblin Welder (1/1, T: Choose target artifact a player controls and target artifact card in that player's graveyard. If both targets are still legal as this ability resolves, that player simultaneously sacrifices the artifact and returns the artifact card to play)
(U) Epochrasite (1/1, ~comes into play with three +1/+1 counters on it if you didn't play it from your hand. When ~ is put into a graveyard from play, remove it from the game with three time counters on it and it gains suspend)
(T) Solemn Simulacrum (2/2, when ~ comes into play, search for a basic land and put it into play tapped. when ~ is put in a graveyard from play, draw a card)
(S) Sundering Titan (7/10, When Sundering Titan comes into play or leaves play, choose a land of each basic land type, then destroy those lands)
GY:
RFG:
---
Mooseman: 20
Hand: 4
Library: 32
Play:
(TT) Island
Mana Web (Whenever any land target opponent controls is tapped for mana, tap all lands he or she controls that can produce any type of mana that land can produce.)
Elemental Mastery (EC,Enchanted creature has "T: Put X 1/1 red Elemental creature tokens with haste into play, where X is this creature's power. Remove them from the game at end of turn." )
(U)
Izzet Guildmage (2/2,2U: Copy target instant spell you control with converted mana cost 2 or less. You may choose new targets for the copy.
2R: Copy target sorcery spell you control with converted mana cost 2 or less. You may choose new targets for the copy. )
~Mastered~
GY: Mountain, Island (destroyed?)
RFG: