Squandered Resources

Sacrifice a land: Add one mana of any type the sacrificed land could produce.

Natural Balance

Each player who controls six or more lands chooses five lands they control and sacrifices the rest. Each player who controls four or fewer lands may search their library for up to X basic land cards and put them onto the battlefield, where X is five minus the number of lands they control. Then each player who searched their library this way shuffles.

Enlightened Tutor

Search your library for an artifact or enchantment card, reveal it, then shuffle and put that card on top.

Island

Scrubland

Bayou

Abeyance

Until end of turn, target player can't cast instant or sorcery spells, and that player can't activate abilities that aren't mana abilities.
Draw a card.

Regrowth

Return target card from your graveyard to your hand.

Forest

Finale of Revelation

Draw X cards. If X is 10 or more, instead shuffle your graveyard into your library, draw X cards, untap up to five lands, and you have no maximum hand size for the rest of the game.
Exile Finale of Revelation.

Ponder

Look at the top three cards of your library, then put them back in any order. You may shuffle.
Draw a card.

Underground Sea

Exploration

You may play an additional land on each of your turns.

Exsanguinate

Each opponent loses X life. You gain life equal to the life lost this way.

Savannah

Cadaverous Bloom

Exile a card from your hand: Add {B}{B} or {G}{G}.

Meditate

Draw four cards. You skip your next turn.