While most rituals let you gain an extra 1-3 mana on top of what you paid for them, Channel lets you turn 2 green mana into as much colorless as you can afford with your life total, which is enough to power out a massive X spell like Fireball or Emrakul, the Aeons Torn
It has a nice reprint of Heroic Intervention in there, too, while Raise the Palisade still fetches a decent price
The Hieratic deck has a number of very powerful in-archetype Spell and Trap cards, but no way to search them
The game can play 1 4 people, but if you are wanting to play with 3-4 people you are really going to need a second core straight from the off, just to have enough cards to build 4 decks at once
Meanwhile, its Moonlight Shuriken attack is incredibly versatile, enabling you to take two knockouts in a single turn
For example, you can attach them to your opponents monsters as long as theres no specific card text that says otherwise