They gain an advantage over opponents and deal damage while also gaining life
Those decks usually load a single creature (often your commander) with gear to swing in for massive damage
PP Draw a card for each creature that died under your control this turn
As your Commander, Dawnsire's colorless identity is another major limitation, but in the 99 of a Spacecraft deck it can be a flashy, if pricey top end
Purging Stormbrood Purging Stormbrood comes in swinging as a 4/4 flier, but it also strips counters off a creature when it enters
For example, if you somehow used Souls of the Lost to craft Mastercraft Raptor (perhaps because it became a copy of a Dinosaur), its power while in exile is equal to the number of permanent cards in your graveyard, and Mastercraft Raptor's power will change as the number of permanent cards in your graveyard changes