Impact Tremors

Whenever a creature you control enters, Impact Tremors deals 1 damage to each opponent.

Elven Farsight

Scry 3, then you may reveal the top card of your library. If it's a creature card, draw a card.

Midnight Guard

Whenever another creature enters, untap Midnight Guard.

Forest

Tamiyo's Safekeeping

Target permanent you control gains hexproof and indestructible until end of turn. You gain 2 life. (A permanent with hexproof and indestructible can't be the target of spells or abilities your opponents control. Damage and effects that say "destroy" don't destroy it.)

Wooded Ridgeline

({T}: Add {R} or {G}.)
Wooded Ridgeline enters tapped.

Prevent all combat damage that would be dealt this turn.

Mountain

Essence Warden

Whenever another creature enters, you gain 1 life.

Crashing Drawbridge

Defender
{T}: Creatures you control gain haste until end of turn.

Presence of Gond

Enchant creature
Enchanted creature has "{T}: Create a 1/1 green Elf Warrior creature token."

Radiant Grove

({T}: Add {G} or {W}.)
Radiant Grove enters tapped.

Plains

Generous Ent

Reach
When Generous Ent enters, create a Food token. (It's an artifact with "{2}, {T}, Sacrifice this artifact: You gain 3 life.")
Forestcycling {1} ({1}, Discard this card: Search your library for a Forest card, reveal it, put it into your hand, then shuffle.)

Soul Warden

Snakeskin Veil

Put a +1/+1 counter on target creature you control. It gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)