Vorinclex, Voice of Hunger

Trample
Whenever you tap a land for mana, add one mana of any type that land produced.
Whenever an opponent taps a land for mana, that land doesn't untap during its controller's next untap step.

Retreat to Coralhelm

Landfall — Whenever a land you control enters, choose one —
• You may tap or untap target creature.
• Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Awakening

At the beginning of each upkeep, untap all creatures and lands.

Blossom Dryad

Candelabra of Tawnos

Earthcraft

Tap an untapped creature you control: Untap target basic land.

Magus of the Candelabra

Snap

Return target creature to its owner's hand. Untap up to two lands.

Argothian Elder

Rewind

Counter target spell. Untap up to four lands.

Thrasios, Triton Hero

{4}: Scry 1, then reveal the top card of your library. If it's a land card, put it onto the battlefield tapped. Otherwise, draw a card.
Partner (You can have two commanders if both have partner.)