new rat cards mtg Karumonix, the King look at the top five cards of your library mtg commander rat deck This

The one deck that might want a card like this is an Aristocrats Commander deck

There are only two different commander decks available for Wilds of Eldraine

Warp Speed Ahead By paying an alternate, lower Warp cost, you may cast any spell with this effect from your hand and gain its upsides for a turn, before it goes into exile, where you may cast it on a later turn

A Lotus Bloom, Ad Nauseam, Angels Grace kill on Turn 4 costs six mana, but you have three from the Lotus Bloom and four land drops

This is mostly done because the game renders the visual of the deck in-game to a size dependent on the number of cards in it