people talking about loam again and a bit of geology gave me some ideas
Release from Stone
Instant
Put two 1/1 white Spirit creature tokens with flying onto the battlefield.
Subduct
(When you cast this spell, you may discard a land card. If you do, copy this spell.)
Royal Geologist
Creature — Human Artificer
Vigilance
Exile a land card from your graveyard: Royal Geologist gets +1/+1 until end of turn. Activate this ability only once each turn.
2/2
Erode
Instant
Return target permanent or spell to its owner’s hand.
Stratigraphic Correlation
Instant
Scry 1, then draw a card.
Subduct
(When you cast this spell, you may discard a land card. If you do, copy this spell.)
Forgotten Predator
Creature — Elemental
Forgotten Predator can’t block.
Exile a land card from your graveyard: Return Forgotten Predator from your graveyard to the battlefield.
2/1
Mass Extinction
Sorcery
All creatures get -2/-2 until end of turn.
Subduct
(When you cast this spell, you may discard a land card. If you do, copy this spell.)
Tectonic Burial
Instant
Each player sacrifices a creature.
Subduct
(When you cast this spell, you may discard a land card. If you do, copy this spell.)
Manazoic Eruption
Sorcery
Shuffle your library. Then exile the top card of your library. Until end of turn, you may play that card without paying its mana cost.
(If it has X in its mana cost, X is 0.)
Subduct
(When you cast this spell, you may discard a land card. If you do, copy this spell.)
Melt Reality
Instant
Melt Reality deals X damage to target creature, where X is the number of land cards in your graveyard.
Subduct
(When you cast this spell, you may discard a land card. If you do, copy this spell. You may choose new targets for the copy.)
Pyroclastic Force
Creature — Elemental
Haste
, Discard a land card: Pyroclastic Force deals 2 damage to target creature or player.
3/2
Cycle of Stone
Enchantment
, Discard a land card: Search your library for a land card, reveal that card, and put it into your hand. Then shuffle your library.
Macroscopic Archaea
Creature — Ooze
Flash
Reach
When Macroscopic Archaea enters the battlefield, Return up to three target land cards from your graveyard to your hand.
2/2
Ancient Caldera
Land
: Add
to your mana pool.
: Put an eon counter on Ancient Caldera.
,
, Sacrifice Ancient Caldera: Ancient Caldera deals 10 damage to each creature and each player. Activate this ability only if Ancient Caldera has ten or more eon counters on it.
Banded Iron Formation
Land
: Add
to your mana pool.
, Sacrifice Banded Iron Formation: Put a 1/1 colorless Ooze token onto the battlefield.
: Return Banded Iron Formation from your graveyard to the battlefield tapped. You may only activate this ability if you control no creatures.
Rift Valley
Land
: Add
to your mana pool. Rift Valley deals 1 damage to you. Put an eon counter on Rift Valley.
, Sacrifice Rift Valley: Return two target land cards from your graveyard to the battlefield tapped. Activate this ability only if Rift Valley has four or more eon counters on it.
Volcanic Arc
Land
: Add
to your mana pool. Volcanic Arc deals 1 damage to you. Put an eon counter on Volcanic Arc.
When there are four or more eon counters on Volcanic Arc, sacrifice it and search your library for up to two Mountain cards and put them onto the battlefield. Then shuffle your library.