After sacrificing Zack and sending him to your graveyard instead of your command zone, reanimation effects like the one on Sun Titan can bring him back into play or to your hand to restart the gameplay loop , allowing you to keep stacking counters on your creatures

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The plastic case can store up to 80 sleeved cards and protect them from damage
The cost reduction applies only to generic mana in the total cost of black spells you cast
If you have them, you can then use Stampede to deal damage on already-damaged enemy characters or Iago, Loud-Mouthed Parrot to force opponents into attacking you