Mountain

Beast Attack

Create a 4/4 green Beast creature token.
Flashback {2}{G}{G}{G} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Godsire

Vigilance
{T}: Create an 8/8 Beast creature token that's red, green, and white.

Keeper of the Beasts

{G}, {T}: Choose target opponent who controls more creatures than you do as you activate this ability. Create a 2/2 green Beast creature token.

Ivy Lane Denizen

Whenever another green creature you control enters, put a +1/+1 counter on target creature.

Thresher Beast

Whenever Thresher Beast becomes blocked, defending player sacrifices a land of their choice.

Krosan Warchief

Beast spells you cast cost {1} less to cast.
{1}{G}: Regenerate target Beast.

Beast Whisperer

Whenever you cast a creature spell, draw a card.

Elder Gargaroth

Vigilance, reach, trample
Whenever Elder Gargaroth attacks or blocks, choose one —
• Create a 3/3 green Beast creature token.
• You gain 3 life.
• Draw a card.

Scurry Oak

Evolve (Whenever a creature you control enters, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.)
Whenever one or more +1/+1 counters are put on Scurry Oak, you may create a 1/1 green Squirrel creature token.

Forest

Leery Fogbeast

Whenever Leery Fogbeast becomes blocked, prevent all combat damage that would be dealt this turn.

Plains

Somberwald Beastmaster

When Somberwald Beastmaster enters, create a 2/2 green Wolf creature token, a 3/3 green Beast creature token, and a 4/4 green Beast creature token.
Creature tokens you control have deathtouch. (Any amount of damage they deal to a creature is enough to destroy it.)

Advocate of the Beast

At the beginning of your end step, put a +1/+1 counter on target Beast creature you control.

Herd Baloth

Whenever one or more +1/+1 counters are put on Herd Baloth, you may create a 4/4 green Beast creature token.