Mountain

Thunder of Hooves

Thunder of Hooves deals X damage to each creature without flying and each player, where X is the number of Beasts on the battlefield.

Tephraderm

Whenever a creature deals damage to this creature, this creature deals that much damage to that creature.
Whenever a spell deals damage to this creature, this creature deals that much damage to that spell's controller.

Forest

Erratic Explosion

Choose any target. Reveal cards from the top of your library until you reveal a nonland card. Erratic Explosion deals damage equal to that card's mana value to that permanent or player. Put the revealed cards on the bottom of your library in any order.

Krosan Groundshaker

{G}: Target Beast creature gains trample until end of turn.

Chain of Plasma

Chain of Plasma deals 3 damage to any target. Then that player or that permanent's controller may discard a card. If the player does, they may copy this spell and may choose a new target for that copy.

Cryptic Gateway

Tap two untapped creatures you control: You may put a creature card from your hand that shares a creature type with each creature tapped this way onto the battlefield.

Elvish Pioneer

When this creature enters, you may put a basic land card from your hand onto the battlefield tapped.

Snapping Thragg

Whenever this creature deals combat damage to a player, you may have it deal 3 damage to target creature that player controls.
Morph {4}{R}{R} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

Wirewood Elf

Barkhide Mauler

Cycling {2} ({2}, Discard this card: Draw a card.)

Charging Slateback

This creature can't block.
Morph {4}{R} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

Battering Craghorn

First strike
Morph {1}{R}{R} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

Primal Boost

Target creature gets +4/+4 until end of turn.
Cycling {2}{G} ({2}{G}, Discard this card: Draw a card.)
When you cycle this card, you may have target creature get +1/+1 until end of turn.

Wirewood Savage

Whenever a Beast enters, you may draw a card.

Venomspout Brackus

{1}{G}, {T}: This creature deals 5 damage to target attacking or blocking creature with flying.
Morph {3}{G}{G} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

Naturalize

Solar Blast

Solar Blast deals 3 damage to any target.
Cycling {1}{R}{R} ({1}{R}{R}, Discard this card: Draw a card.)
When you cycle this card, you may have it deal 1 damage to any target.

Forgotten Cave

This land enters tapped.
{T}: Add {R}.
Cycling {R} ({R}, Discard this card: Draw a card.)

Snarling Undorak

{2}{G}: Target Beast creature gets +1/+1 until end of turn.
Morph {1}{G}{G} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

Aether Charge

Whenever a Beast you control enters, you may have it deal 4 damage to target opponent or planeswalker.

Shaleskin Bruiser

Trample
Whenever this creature attacks, it gets +3/+0 until end of turn for each other attacking Beast.

Tranquil Thicket

This land enters tapped.
{T}: Add {G}.
Cycling {G} ({G}, Discard this card: Draw a card.)

Explosive Vegetation

Search your library for up to two basic land cards, put them onto the battlefield tapped, then shuffle.

Towering Baloth

Morph {6}{G} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)