Basic

Basic is a supertype found on the basic lands Plains, Island, Swamp, Mountain, Forest, Snow-Covered Plains, Snow-Covered Island, Snow-Covered Swamp, Snow-Covered Mountain, Snow-Covered Forest.

A card with the Basic supertype has special rules associated with it: it is not bound by the four card maximum rule that other cards are restricted to in constructed decks.

The word Basic was first seen on the basic lands in Eighth Edition in order to help players understand what exactly the term meant, as the basic land types (Plains, Island, Swamp, Mountain and Forest) were not always associated with basic lands (such as the original dual lands printed in the Beta set).

Although Relentless Rats is not bound by the four-card maximum, it does not have the supertype basic.