Iconic Cards: Splinter Twin, Senseis Divining Top, Copy Cat, Living End, Primeval Titan, Grinding Station Popular Decks: Oops, All Spells!, Twin, Grinding Station, Mill, Belcher, Storm 6 Ramp Ramp decks want to generate a ton of mana to cast really powerful cards
Say you have a copy of Shadowspear on the board and you forget its a legend
Past Modern Horizons examples include Yawgmoth, Thran Physician, Crashing Footfalls, Urza's Saga and Ragavan, Nimble Pilferer
For example, lets say we wish to know the likelihood of drawing exactly one Force of Will in our starting hand of seven cards from a 60-card deck containing four Force of Wills
Its definitely worth adding a card to your inkwell for the first five turns, but you dont have to keep doing that forever