Krosan Warchief

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

Wirewood Savage

Whenever a Beast enters the battlefield, you may draw a card.

Trudge Garden

Whenever you gain life, you may pay {2}. If you do, create a 4/4 green Fungus Beast creature token with trample.

Blossoming Bogbeast

Whenever Blossoming Bogbeast attacks, you gain 2 life. Then creatures you control gain trample and get +X/+X until end of turn, where X is the amount of life you gained this turn.

Totem Speaker

Whenever a Beast enters the battlefield, you may gain 3 life.

Forest

Beast Within

Destroy target permanent. Its controller creates a 3/3 green Beast creature token.

Ravenous Baloth

Arboreal Grazer

Reach
When Arboreal Grazer enters the battlefield, you may put a land card from your hand onto the battlefield tapped.

Leafkin Druid

{T}: Add {G}. If you control four or more creatures, add {G}{G} instead.

Appetite for the Unnatural

Destroy target artifact or enchantment. You gain 2 life.

Feed the Clan

You gain 5 life.
Ferocious — You gain 10 life instead if you control a creature with power 4 or greater.

Sproutback Trudge

This spell costs {X} less to cast, where X is the amount of life you gained this turn.
Trample
At the beginning of your end step, if you gained life this turn, you may cast Sproutback Trudge from your graveyard.