Keyword: Landfall

Landfall — Whenever a land enters the battlefield under your control, create a 5/5 red and green Elemental creature token.
Whenever Omnath, Locus of Rage or another Elemental you control dies, Omnath deals 3 damage to any target.

Landfall — Whenever a land enters the battlefield under your control, Valakut Predator gets +2/+2 until end of turn.

Landfall — Whenever a land enters the battlefield under your control, choose one —
• Target creature gets +2/+0 until end of turn.
• Target creature can’t block this turn.

Menace (This creature can’t be blocked except by two or more creatures.)
Landfall — Whenever a land enters the battlefield under your control, Geyserfield Stalker gets +2/+2 until end of turn.

Trample
Landfall — Whenever a land enters the battlefield under your control, Grove Rumbler gets +2/+2 until end of turn.

Flying
Landfall — Whenever a land enters the battlefield under your control, tap target creature an opponent controls. If that land is an Island, that creature doesn’t untap during its controller’s next untap step.

If damage would be dealt to Undergrowth Champion while it has a +1/+1 counter on it, prevent that damage and remove a +1/+1 counter from Undergrowth Champion.
Landfall — Whenever a land enters the battlefield under your control, put a +1/+1 counter on Undergrowth Champion.

Landfall — Whenever a land enters the battlefield under your control, choose one —
• Put a +1/+1 counter on target creature.
• You gain 2 life.

Flying
Landfall — Whenever a land enters the battlefield under your control, other creatures you control get +1/+0 until end of turn. If that land is a Swamp, those creatures get +2/+0 until end of turn instead.

Landfall — Whenever a land enters the battlefield under your control, choose one —
• Create a 1/1 white Kor Ally creature token.
• Creatures you control get +1/+1 until end of turn.

Landfall — Whenever a land enters the battlefield under your control, Scythe Leopard gets +1/+1 until end of turn.

Landfall — Whenever a land enters the battlefield under your control, you may pay . If you do, create a 3/1 red Elemental creature token with trample and haste. Exile that token at the beginning of the next end step.

Landfall — Whenever a land enters the battlefield under your control, Territorial Baloth gets +2/+2 until end of turn.

First strike
Landfall — Whenever a land enters the battlefield under your control, Ondu Greathorn gets +2/+2 until end of turn.

Trample
Landfall — Whenever a land enters the battlefield under your control, Makindi Sliderunner gets +1/+1 until end of turn.

Landfall — Whenever a land enters the battlefield under your control, choose one —
• You may tap or untap target creature.
• Scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)

Landfall — Whenever a land enters the battlefield under your control, choose one —
• Target creature gets +1/+0 and gains deathtouch until end of turn.
• Each opponent loses 1 life and you gain 1 life.

Defender
Landfall — Whenever a land enters the battlefield under your control, you gain 1 life.

Flying
Landfall — Whenever a land enters the battlefield under your control, you may return target nonland permanent card from your graveyard to your hand. If that land is a Plains, you may return that nonland permanent card to the battlefield instead.

Landfall — Whenever a land enters the battlefield under your control, Snapping Gnarlid gets +1/+1 until end of turn.

Flying, haste
Akoum Firebird attacks each combat if able.
Landfall — Whenever a land enters the battlefield under your control, you may pay . If you do, return Akoum Firebird from your graveyard to the battlefield.

Landfall — Whenever a land enters the battlefield under your control, Belligerent Whiptail gains first strike until end of turn.

Flying
Landfall — Whenever a land enters the battlefield under your control, Akoum Hellkite deals 1 damage to any target. If that land is a Mountain, Akoum Hellkite deals 2 damage instead.

When Avenger of Zendikar enters the battlefield, create a 0/1 green Plant creature token for each land you control.
Landfall — Whenever a land enters the battlefield under your control, you may put a +1/+1 counter on each Plant creature you control.

Landfall — Whenever a land enters the battlefield under your control, you may pay . If you do, draw a card.