(As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.)

When Invasion of Ergamon enters the battlefield, create a Treasure token. Then you may discard a card. If you do, draw a card.

Trample

When Truga Cliffcharger enters the battlefield, you may discard a card. If you do, search your library for a land or battle card, reveal it, put it into your hand, then shuffle.