This is doubly true of typal payoffs that care about how many of the supported type of creature you control, or ones with creaturefall effects that want to see more bodies enter the battlefield
This is an eminently valuable and flexible effect, as you can choose however many cards you want to scoot back into the top of your library, then replace them with that many new cards
1 Dimir Aqueduct
Florian stands out as one of the most card-efficient of all the best Vampire Commanders MTG offers for aggressive, card-selection builds

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What can you use her for, though