Back to Basics

Nonbasic lands don't untap during their controllers' untap steps.

Seedborn Muse

Untap all permanents you control during each other player's untap step.

Damping Sphere

If a land is tapped for two or more mana, it produces {C} instead of any other type and amount.
Each spell a player casts costs {1} more to cast for each other spell that player has cast this turn.

Static Orb

As long as Static Orb is untapped, players can't untap more than two permanents during their untap steps.

Manglehorn

When Manglehorn enters, you may destroy target artifact.
Artifacts your opponents control enter tapped.

Archelos, Lagoon Mystic

As long as Archelos, Lagoon Mystic is tapped, other permanents enter tapped.
As long as Archelos is untapped, other permanents enter untapped.

Energy Flux

All artifacts have "At the beginning of your upkeep, sacrifice this artifact unless you pay {2}."

Collector Ouphe

Activated abilities of artifacts can't be activated.

Root Maze

Winter Orb

As long as Winter Orb is untapped, players can't untap more than one land during their untap steps.

Stasis

Players skip their untap steps.
At the beginning of your upkeep, sacrifice Stasis unless you pay {U}.