Realmwright

A one-mana enchantment-effect stapled to a fragile body, doing the structural work of a land animation in reverse: instead of turning lands into creatures, it grants every land you control a single basic type of your choosing, permanently, for as long as it sticks around. The lineage here runs through cards that retype the battlefield (Urborg, Tomb of Yawgmoth and Yavimaya, Cradle of Growth do the same job from a land slot), but those affect all lands; Realmwright limits the grant to the lands you control, which makes it a fixer rather than a mutual concession. The choice happening on entry, not as an activated ability, is what fences the power: you lock in one type and live with it, so this is a deckbuilding decision made on the battlefield rather than a flexible knob you adjust turn to turn. Two practical edges fall out of that design. Nonbasic lands keep their own types and abilities while gaining the chosen one, so a tapland or a fetch-fixed dual still does its job and now also taps for your color. And lands that already trigger off basic types (anything keyed to a Mountain or a Forest) suddenly read every one of your lands as that type. The 1/1 Wizard body is the cost of admission: the moment it dies, the typing reverts, which keeps the effect honest by tying a sweeping manabase rewrite to a creature anyone can answer.