Channel

Cards carrying the Channel keyword ability, which lets you discard the card from your hand and pay a cost to get a one-time effect instead of playing it normally. The Kamigawa nonbasic lands shine here: Boseiju, Who Endures destroys an artifact, enchantment, or nonbasic land, while Otawara, Soaring City bounces a permanent to its owner's hand. Creatures use it too, with Greater Tanuki searching up a land and Colossal Skyturtle offering multiple Channel options. This flexibility lets a land double as interaction or a creature double as a spell when drawn at the wrong time.