Decks like Dredge and Crab Vine Mill so many cards so fast that Creeping Chill is a no-brainer inclusion, giving you additional damage and lifegain at a very low opportunity cost
If you pay one mana, they only need to reveal one land until they stop milling
It even helps you dig past two lands by functioning kind of like Oracle of Mul Daya
As a result, the archetype has received a ton of support over time, with a lot of legendary creatures in particular being printed to represent it
Its second ability lets the monarch, whoever they are, to draw an extra card at the start of the end step
Thinking about your side of the field, cards like End the Festivities, Forked Bolt, and Play with Fire are burn spells that are very good to deal with convoke decks or small creature/weenie decks, while not being useless against midrange or control