Once you dilute that ratio, you might find yourself stuck without the mana you need or with the wrong half of your deck in your opening hand
Indeed Death's Shadow makes it a perk to nug yourself for 2 in those constructed formats
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Ajani Steadfast Arahbo, Roar of the World Athreos, God of Passage Captain Sisay Daryl, Hunter of Walkers Domri Rade Ephara, God of the Polis Erebos, God of the Dead Gisela, Blade of Goldnight Glenn, the Voice of Calm Heliod, God of the Sun Heliod, Sun-Crowned Ink-Eyes, Servant of Oni Iroas, God of Victory Karametra, God of Harvests Kaya, Ghost Assassin Keranos, God of Storms Kroxa, Titan of Death's Hunger Kruphix, God of Horizons Lucille Marrow-Gnawer Meren of Clan Nel Toth Michonne, Ruthless Survivor Mirri, Weatherlight Duelist Mogis, God of Slaughter Narset, Enlightened Master Negan, the Cold-Blooded Nylea, God of the Hunt Oona, Queen of the Fae Pharika, God of Affliction Phenax, God of Deception Purphoros, God of the Forge Reaper King Rick, Steadfast Leader Saskia the Unyielding Shalai, Voice of Plenty Sliver Overlord Tamiyo, Field Researcher Teferi, Hero of Dominaria Thalia, Guardian of Thraben Thassa, God of the Sea The Mimeoplasm The Ur-Dragon Uro, Titan of Nature's Wrath Vendilion Clique Vraska, Golgari Queen Xenagos, God of Revels

The first being instant and sorcery cards you cast cost one less for each creature token you control
Suffice it to say, Menace was an elegant answer to a long-term problem