This can be found at the bottom of the card, where it says retreat
One way to go about this is to create copies of your dragon spirit with Jaxis, the Troublemaker and use the legend rule to facilitate those death triggers, leaving your commander intact
Putting the first one in main and 2-3 sideboard gives you another strong late game draw at very little opportunity cost
It severely punishes decks that summon multiple times in one turn, as after five summons it can be used
Price, Value, and What You Actually Need It is easy to reach for the cheapest option, especially early in the hobby
For starters, it can clearly attack by throwing snowballs, as you can tap it to deal one damage to a creature its blocking