Prevent all combat damage that would be dealt this turn.

Wild Growth

Enchant land
Whenever enchanted land is tapped for mana, its controller adds an additional {G}.

Titanic Growth

Target creature gets +4/+4 until end of turn.

Blanchwood Armor

Enchant creature
Enchanted creature gets +1/+1 for each Forest you control.

Rhox

You may have Rhox assign its combat damage as though it weren't blocked.
{2}{G}: Regenerate Rhox. (The next time this creature would be destroyed this turn, it isn't. Instead tap it, remove all damage from it, and remove it from combat.)

Doubling Chant

For each creature you control, you may search your library for a creature card with the same name as that creature. Put those cards onto the battlefield, then shuffle.

Giant Growth

Target creature gets +3/+3 until end of turn.

Fyndhorn Elder

Elvish Aberration

{T}: Add {G}{G}{G}.
Forestcycling {2} ({2}, Discard this card: Search your library for a Forest card, reveal it, put it into your hand, then shuffle.)

Spinebiter

Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)
You may have Spinebiter assign its combat damage as though it weren't blocked.

Monstrous Growth

Pride of Lions

You may have Pride of Lions assign its combat damage as though it weren't blocked.

Tornado Elemental

When Tornado Elemental enters, it deals 6 damage to each creature with flying.
You may have Tornado Elemental assign its combat damage as though it weren't blocked.

Thorn Elemental

You may have Thorn Elemental assign its combat damage as though it weren't blocked.

Fyndhorn Elves

Reclaiming Vines

Destroy target artifact, enchantment, or land.

Lone Wolf

You may have Lone Wolf assign its combat damage as though it weren't blocked.

Siege Behemoth

Hexproof
As long as Siege Behemoth is attacking, for each creature you control, you may have that creature assign its combat damage as though it weren't blocked.

Forest

Asceticism

Creatures you control have hexproof.
{1}{G}: Regenerate target creature. (The next time it would be destroyed, instead tap it, remove it from combat, and heal all damage on it.)