While theres no universal rule, most Commander decks should aim for around 38 or 39 lands, complemented by roughly 8 mana rocks, ramp spells, or mana-producing creatures (such as Sol Ring, Arcane Signet, Rampant Growth, or Birds of Paradise)
If you want to double down on that likelihood, cards such as Whispersilk Cloak will join the conversation
Sheoldred, Whispering One Role: Sheoldred is one of the seven Steel Thanes that struggle for power over black-aligned faction of Phyrexia, and she currently holds the title of praetor
If the checklist card is face up in a public zone, it should be set aside and the double-faced card or meld card that it represents should be used instead
It was a cheap way to get rid of some massive threats, especially indestructible ones
Pairing this Simic card with another token doubler like Doubling Season can get serious numbers of tokens onto the battlefield