Further to this it is nice to have some cards that can reshuffle things from hand back into your library
While Dimir does have a lot of cheap Fliers to hold off your threats, its also much slower than you on average
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The most common way that will happen is if a permanent with daybound appears on the battlefield
Korvold, Fae-Cursed King Korvold, Fae-Cursed King has two very simple things working in its favor: As one of the best Jund commanders, its color identity provides access to lots of great cards that pair amazingly with it, and its second ability triggers whenever you sacrifice any other permanent

Aeve, Progenitor Ooze Arboreal Alliance Biowaste Blob Bramble Sovereign Bushy Bodyguard Caller of the Pack Caller of the Untamed Chatterstorm City of Death Domesticated Mammoth (playtest) Druid's Deliverance Dual Nature Elvish Hydromancer Endless Swarm Esika's Chariot Fanatic of Rhonas Fin-Clade Fugitives Full Flowering Giant Adephage Hatchery Sliver Honored Hydra Horncaller's Chant Hunting Pack Jubilation Life Finds a Way Ochre Jelly Parallel Evolution Pawpatch Recruit Penumbra Umbra (playtest) Polygoyf Polyraptor Pool of Vigorous Growth Resilient Khenra Rootcast Apprenticeship Rust-Shield Rampager Scion of Calamity Scurry of Squirrels Scute Swarm Second Harvest Selesnya Eulogist Spawnwrithe Splitting Slime Springheart Nantuko Sprouting Phytohydra Tender Wildguide Timeless Witness Vaultborn Tyrant Watchful Radstag