You can kill an annoying enchantment like Sylvan Library just as easily as a Consecrated Sphinx
Any rogue deck that features black and cares about the number of rogues you have on the field can take advantage of the Shapeshifter tokens you get from Black Market Connections or Vaan, Street Thief
You may cast that card without paying its mana cost if the spell's mana value is less than or equal to the amount of life you gained this turn
it features more players, bigger decks, and longer, more involved games
A 'power 5' themed deck could take a twist of just running creatures that meet that criteria, with cards like: Terastodon Archetype of Endurance Ruric Thar, the Unbowed Spearbreaker Behemoth 8 Arna Kennerud, Skycaptain Master At Arms The Human Knight Esper Arna Kennerud, Skycaptain is an absolute powerhouse that doesnt require any fancy combos or game changer cards, instead, you can just beat face with a very strong creature and a ton of auras and equipment
Prismari Command looks like a safe place to start, but Im particularly appreciative of the built-in synergy with the aforementioned sorcery payoffs