Rogue's Passage is an unblockable enabler, Abzan Falconer and The Wind Crystal are your flying enablers, and one-sided sweepers like Mass Calcify and Wave of Reckoning open up the board for you
All five of these lands will see play in Standard
Opalescence is clearly an enchantment deck build-around, which let you turn Replenish into not only a source of lots of virtual card advantage, but also a massive battlefield position that could easily dominate and end the game
If you blink, cascade, discover, or exile cards from graveyards, you get to draw
The back up strategy is to go get the legendary land Valakut, the Molten Pinnacle, which makes it so if you have five Mountains in play and then play another, you get to deal 3 damage to a player or creature