Acridian

Echo {1}{G} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)

Terror

Destroy target nonartifact, nonblack creature. It can't be regenerated.

Harrow

As an additional cost to cast this spell, sacrifice a land.
Search your library for up to two basic land cards, put them onto the battlefield, then shuffle.

Rejuvenate

You gain 6 life.
Cycling {2} ({2}, Discard this card: Draw a card.)

Gravedigger

When Gravedigger enters, you may return target creature card from your graveyard to your hand.

Albino Troll

Echo {1}{G} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)
{1}{G}: Regenerate Albino Troll.

Gaea's Touch

{0}: You may put a basic Forest card from your hand onto the battlefield. Activate only as a sorcery and only once each turn.
Sacrifice Gaea's Touch: Add {G}{G}.

Reflecting Pool

{T}: Add one mana of any type that a land you control could produce.

Hidden Horror

When Hidden Horror enters, sacrifice it unless you discard a creature card.

Fyndhorn Elves

Duress

Target opponent reveals their hand. You choose a noncreature, nonland card from it. That player discards that card.

Rootbreaker Wurm

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

Avoid Fate

Counter target instant or Aura spell that targets a permanent you control.

Llanowar Elves

Death's Duet

Return two target creature cards from your graveyard to your hand.

Bull Elephant

When Bull Elephant enters, sacrifice it unless you return two Forests you control to their owner's hand.

Bayou

Crash of Rhinos

Polluted Mire

Polluted Mire enters tapped.
{T}: Add {B}.
Cycling {2} ({2}, Discard this card: Draw a card.)

Swamp

Catacomb Dragon

Flying
Whenever Catacomb Dragon becomes blocked by a nonartifact, non-Dragon creature, that creature gets -X/-0 until end of turn, where X is half the creature's power, rounded down.