If you and I both have a copy of Narset in play, we can't draw more than one card per turn, but we both can still use impulse-like effects like Narset's own ability
For Keruga, the Macrosage, that constraint is not including any one- or two-cost cards in your deck
Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Legal Toolbox Notes and Rules Information for Escape to the Wilds: The additional land that you play doesn't have to be from among the exiled cards

Chandra Ablaze Chandra Nalaar Chandra, Acolyte of Flame Chandra, Awakened Inferno Chandra, Bold Pyromancer Chandra, Dressed to Kill Chandra, Fire Artisan Chandra, Flame's Catalyst Chandra, Flame's Fury Chandra, Flamecaller Chandra, Flameshaper Chandra, Heart of Fire Chandra, Hope's Beacon Chandra, Legacy of Fire Chandra, Novice Pyromancer Chandra, Pyrogenius Chandra, Pyromaster Chandra, Roaring Flame Chandra, Spark Hunter Chandra, Torch of Defiance Chandra, the Firebrand Daretti, Scrap Savant Jaya Ballard Jaya, Fiery Negotiator Jaya, Venerated Firemage Jeska, Thrice Reborn Koth of the Hammer Koth, Fire of Resistance Lukka, Coppercoat Outcast Lukka, Wayward Bonder Rowan Kenrith Rowan, Fearless Sparkmage Rowan, Scholar of Sparks Sarkhan the Masterless Sarkhan, Dragonsoul Sarkhan, Fireblood Sarkhan, the Dragonspeaker Tibalt, Rakish Instigator Tibalt, the Fiend-Blooded Zariel, Archduke of Avernus