Secret Lair Drop

Creature — Elemental Shaman

When this creature enters, you may search your library for an Elemental card, reveal it, then shuffle and put that card on top.

Flamekin Harbinger

Elemental

Legendary Creature — Elemental

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

Omnath, Locus of Rage

Creature — Elemental

Whenever this creature or another Elemental you control enters, look at the top card of your library. If it's a land card, you may put it onto the battlefield tapped. If you don't put the card onto the battlefield, put it into your hand.

Risen Reef

Whenever an opponent casts a spell during your turn and when this creature dies, create a green and white Elemental creature token with "This token's power and toughness are each equal to the number of creatures you control."