Winter Orb

As long as Winter Orb is untapped, players can't untap more than one land during their untap steps.

Cryptic Gateway

Tap two untapped creatures you control: You may put a creature card from your hand that shares a creature type with each creature tapped this way onto the battlefield.

Defiant Elf

Elven Ambush

Create a 1/1 green Elf Warrior creature token for each Elf you control.

Llanowar Elves

Reclamation Sage

When this creature enters, you may destroy target artifact or enchantment.

Forest

Lathril, Blade of the Elves

Menace (This creature can't be blocked except by two or more creatures.)
Whenever Lathril deals combat damage to a player, create that many 1/1 green Elf Warrior creature tokens.
{T}, Tap ten untapped Elves you control: Each opponent loses 10 life and you gain 10 life.