To illustrate this point, lets take a look at a lands and spells hand from Modern Deaths Shadow: While this hand may look like a fine keep, I believe it to be a mulligan
The mana curve of an Eshki Temur Roar deck is rather high, so cards like Gwenna, Eyes of Gaea and Selvala, Heart of the Wilds are especially strong since they'll enable you to generate more mana than they cost to cast
It reminds me of Wizards of the Coasts older Commander precons, which were often more like two or three half-decks in a trenchcoat (the idea being that players would play a few games, get a feel for which mechanics they liked and then start swapping in cards to emphasize that part of the deck)
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WHAT WOULD IMPROVE CERTAINTY Provide clear, well-lit images of the card's front and back, out of sleeve if applicable
Creature Artifact - Construct Phyrexian Color tag templates(None) Creature (CTRL to add secondary) Enchantment Qty: 12 Price: $131.68 Cryptolith Rite Creatures you control have " : Add one mana of any color." Enchantment Color tag templates(None) Dictate of Karametra Flash Whenever a player taps a land for mana, that player adds one mana of any type that land produced