There are plenty of preloaded mana symbols and formatting tools you can click on to add various costs and text to a card, so you dont have to mess with any sort of syntax
Both the Boros matchup and the mirror are all about one answer: I mean, Get Lost doesn't destroy Urabrask's Forge
Another thing to consider is playing cycling lands like Tranquil Thicket or Indatha Triome
One piece of the design we found that I was really personally excited by, perhaps my favourite part of the whole set, are these sagas
Of course, the combo is fragile and folds to removal, but the explosive potential is undeniably there
Combined, this ensures that when Elder Gargaroth goes on the attack it will run over anything smaller in its way which even in Commander is quite likely while not needing to tap to do so