You can absolutely replace your draw with digging for a land, and repeat until all of your lands are in play
Even if the assassins deck is playable in Modern, which seems really questionable on rate, Tax Collector has the largest variety of potential homes
Cards that fall into this category for my example build are: Reforge the Soul Phyrexian Arena Sign in Blood Castle Locthwain Night's Whisper Underworld Connections Change of Fortune Demonic Tutor Shred Memory Dimir Machinations Liliana Vess Ramp Spells Ramp spells are usually mana rocks
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Shakedown Heavy Shakedown Heavy saw some Standard play because its an effective beater and has synergies with Fight Rigging
Since typical Limited decks need their first 3 land drops, would like to hit their 4th land drop, but dont necessarily need 5 lands by turn 5, the age-old standard of 17 lands indeed seems like a good number