While Im okay with the latter if it comes down to it, I do tend to find that its not uncommon for this to trigger again and again, allowing you to put lands onto the battlefield against players who are ramping aggressively - You can even pair this card with Weathered Wayfarer to always find your best lands and put them directly into play
Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Not Legal Toolbox Notes and Rules Information for Once Upon a Time: The earliest opportunity you have to cast Once Upon a Time is during the first player's upkeep, before that player can play a land
Put X +1/+1 counters on target creature you control, where X is your devotion to that color
Also, a shout out to another 2 mana tap for a big effect Gate, Basilisk Gate which can pump up a Commander by a bunch in a Gate brew, and win much more quickly with Commander Damage
Sidar's eminence ability provides a ton of power for the deck, smoothing out your draws throughout the game, letting you hit your land drops early and find gas late game, all while setting up Sidar's incredibly powerful reanimation combat trigger
Who are you running