Colossification

Enchant creature
When this Aura enters, tap enchanted creature.
Enchanted creature gets +20/+20.

Humble Naturalist

{T}: Add one mana of any color. Spend this mana only to cast a creature spell.

Honey Mammoth

When this creature enters, you gain 4 life.

Hyrax Tower Scout

When this creature enters, untap target creature.

Almighty Brushwagg

Trample
{3}{G}: This creature gets +3/+3 until end of turn.

Snarespinner

Reach
Whenever this creature blocks a creature with flying, this creature gets +2/+0 until end of turn.

Titanic Growth

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

Plummet

Ironscale Hydra

If a creature would deal combat damage to this creature, prevent that damage and put a +1/+1 counter on this creature.

Forest

Treeshaker Chimera

All creatures able to block this creature do so.
When this creature dies, draw three cards.

Bristling Boar

This creature can't be blocked by more than one creature.

Colossal Dreadmaw

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

Llanowar Visionary

When this creature enters, draw a card.
{T}: Add {G}.

Ram Through

Target creature you control deals damage equal to its power to target creature you don't control. If the creature you control has trample, excess damage is dealt to that creature's controller instead.

Yorvo, Lord of Garenbrig

Yorvo enters with four +1/+1 counters on it.
Whenever another green creature you control enters, put a +1/+1 counter on Yorvo. Then if that creature's power is greater than Yorvo's power, put another +1/+1 counter on Yorvo.