When this creature enters, sacrifice it unless you discard a land card.
Illustrated by Paolo Parente · Portal · #189
There are no rulings for Thundering Wurm.
When this creature enters, sacrifice it unless you sacrifice a Forest.
When this creature enters, sacrifice it unless you return a basic land card from your graveyard to your hand.
Trample
When this creature enters, sacrifice it unless you pay for each card in your hand.
When this creature enters, you may sacrifice a creature or land. If you do, put two +1/+1 counters on this creature.
When this creature enters, draw a card.