1 Scholar of the Ages
If we're getting a cycle of multicolored lands for standard, I would suggest the Pathways
Furthermore, first strike and double strike do not stack
Deus of Calamity primary damage source, and fits the land destruct theme
The problem is a playset of Gemstone Caverns is currently around $200, tripling the deck's price, but if you are trying to eke out every advantage in a tournament, it's probably worth the price, even though you'll only use it in something like 30% of your games
(Hey, theres another card for Spike!) Over-the-top cards like this are the reason few new equipment cards ever dominate their formatsWizards has found a clear example of too good. This is a card that can dominate just about any format you stick it in, and new players often underestimate its power