One of my first commander decks used to be Lands.dec under Child of Alara that used Prismatic Omen to take advantage of such synergies and often won by having the enchantment in play and then casting Scapeshift to fetch Valakut and a bunch of other lands, burning out my opponents
From Antiquities, we also added more Strip Mines of every version (1-4) and another Version 2 of Mishra's Factory (GD)
Lagrella, the Magpie Lagrella, the Magpie is a strange card to use as a commander
If you put an Aura on an opponent's permanent, you still control the Aura, and mana symbols in its mana cost count toward your devotion
It gets much better if you can add extra counters, notably proliferate (Evolution Sage)
People coordinate on X and Discord to know where to go