You can easily and cheaply increase the power of a players deck with a few custom cards
UNCUT SHEETS Alternate Fourth Edition Uncommon 10 uncut sheet front 7 X 8
Galazeth Prismari takes Treasures (and other artifacts) a step further by letting them act as permanent mana rocks for instants and sorceries, both of which receive a lot of support from cards in the Izzet card pool
Even when Wizards (the company) isnt specifically working on a typal-themed product, they seem to be much more deliberate about what creature types they put on cards: we see far fewer incidental humans than we once did, a greater variety of types used in general, and some real efforts to gradually reinforce a core mechanical identity for even the most humble Brushwaggs and Pests of the world
Whenever you learn you can either rummage (discard a card to draw another card) or put any lesson card from your sideboard into your hand
The higher you go, the less likely your opponents are to win via attacking, but I imagine theres a sweet spot around Bracket 2/3 where this really shines
