Emet-Selch, Ascian (Krrik, Son of Yawgmoth) Phyrexian mana is among the greatest design mistakes Wizards has ever madeso why not make a commander that gives it to every card in your deck
So if youre able to wither them to death, you draw a card
Replacement effects are unaffected by Echoes of Eternity's first ability

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The second ability lets you tap Herd Heirloom to give a creature you control with power four or more trample and to draw a card when it deals combat damage to a player, which is a pretty good deal
Theres also the inherent benefit of deck-thinning, though from a statistical standpoint its not exactly clear that deck-thinning is all that fruitful in a game of Commander