Highland Forest

({T}: Add {R} or {G}.)
This land enters tapped.

Akoum Hellhound

Landfall — Whenever a land you control enters, this creature gets +2/+2 until end of turn.

Phylath, World Sculptor

When Phylath enters, create a 0/1 green Plant creature token for each basic land you control.
Landfall — Whenever a land you control enters, put four +1/+1 counters on target Plant you control.

Shock

Arachnoform

Enchant creature
Enchanted creature gets +2/+2, has reach, and is every creature type.

Evolving Wilds

{T}, Sacrifice this land: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Crash Through

Creatures you control gain trample until end of turn. (Each of those creature can deal excess combat damage to the player or planeswalker it's attacking.)
Draw a card.

Kazandu Stomper

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
When this creature enters, return up to two lands you control to their owner's hand.

Hydra's Growth

Enchant creature
When this Aura enters, put a +1/+1 counter on enchanted creature.
At the beginning of your upkeep, double the number of +1/+1 counters on enchanted creature.

Forest

Goblin Arsonist

When this creature dies, you may have it deal 1 damage to any target.

Mountain

Kazandu Nectarpot

Landfall — Whenever a land you control enters, you gain 1 life.

Honey Mammoth

When this creature enters, you gain 4 life.

Spitfire Lagac

Landfall — Whenever a land you control enters, this creature deals 1 damage to each opponent.