While you could certainly just play Krrik fair as one of the 99 in a mono-black deck as a way to occasionally cast spells ahead of time, this legend shines in a deck built to truly abuse it
This creature is incredibly potent and gives a green deck just about all the mana they could ever need
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Underrated simply means the card is better than its average play rate suggests
Sacrifice expensive cards to Ayara, Widow of the Realm, and then return them to play using Ayara, Furnace Queen
As you open your Play Boosters, sort your cards by color, placing any multicolor, colorless, or land cards into their own piles