foundations mtg card kingdom New Horizons reveal Darksteel Colossus and shuffle it into its owners library instead. Building a Foundation in Magic

What impact do those cards have on the format

You get all of the Lotus Petals

Everything beyond this dual land configuration is a luxury, and City of Brass is the best at making the aforementioned light color splashes a reality

Delirium Whenever a source you control deals noncombat damage to an opponent, if there are four or more card types among cards in your graveyard, Fear of Burning Alive deals that amount of damage to target creature that player controls

Ancestral Recall Depending on the day, this card fluctuates between the #3 and #2 spot as its value is a bit less volatile

They are the same 37 cards that you can find in non-foil in the summer Collector Booster and include cards such as The One Ring, Palantr of Orthanc, and Delighted Halfling