Updated June 5, 2023, by Sean Murray: It's been a while since the release of Tales of Middle-earth, and in that time we've seen the value of many of these Lord of the Rings cards change wildly thanks to the constant fluctuations of Magic's secondary market
This question led to the creation of the Set Booster
That means each of these is completely new to not just Modern, but Magic: The Gathering as a whole
Thankfully, the lowest common denominator is easy to reach since Scar himself already boosts the strength of other Allies
While it requires you to track and remember specific things each turn in order to resolve the trigger in the end step, it does remove the need to disrupt the middle of someones turn to announce triggers in the manner required by cards such as Rhystic Study or Smothering Tithe
The way to connect blue and red is often through cards that reward you for playing a lot of instants and sorceries: Many of the best Izzet cards provide a payoff just for casting spells