This number can often vary wildly, for the same reasons I stated that TCGplayer shifted from using a mean to a median calculation for their average
Historically, such a card would carry with it some sort of drawback, like having to pay two life or sacrifice a creature during upkeep
The card is grindy in a way that is effective in a wide swath of matchups, allowing you to dig for Meddling Mage against Ensnaring Bridge decks, Thalias Lieutenant when you need a blistering clock, or Reflector Mage to answer a large Deaths Shadow
If we look at the odds of drawing into one or more Humans when Sigarda triggers, youd need around 22 Humans in the deck
Unlike core mainline expansions, this premium reprint set compiles the greatest competitive hits from the game's history, upgrades them with gorgeous alternative holofoil patterns, and features the immensely popular Manga Nami chase card