On top of that, if the opponent blocks one of your red Prowess Creatures with Sanctifier en-Vec, you can force the Sanctifier to die in combat by pointing Stomp at the opponents face
Horizon Seeker I think re-useable land tutoring is good, snow-lands are basic lands, so that's neat, 3 to get out and 2 to use is a lot of mana to invest in a potential land tutor for a basic though, and it's not an elf, but rather a human warrior, which generally tend to be white (though obviously not always)
After it became obvious that land destruction(s) will take place, almost certainly with collateral damage, Crucible of Worlds is necessary
#3: Starfield VocalistStarfield Vocalist For the last three cards, I have to say I've gone back and forth a thousand times deciding where to put each of them
However, there are a few Commanders out there who can unlock Altar of the Losts true power