In general, looting a card back to the top of your deck is worse than discarding a card (since you can't take advantage of any graveyard synergies), which means the +1 is only powerful with a very narrow subset of cards (things like Miracles)
Supreme and Stompy: The Superstars of Mono Green and Colorless Friends Mono Green has been in the conversation for a few sets now, however, Core 21 is the catalyst for the re-emergence of its popularity in the meta
Token Triumph (Green-White) Build an unstoppable army with token creatures
Imagine playing Byway Barterer and then immediately casting some kind of Shock to blow up an opposing creature
One of the most common archetypes players will gravitate towards remains the famous Group Hug deck
Its not bad for delirium decks, or for decks that want a critical mass of artifacts, either