For a full comparison, read the Play Boosters vs Collector Boosters MTG booster guide
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They serve to give your side of the board tempo by allowing your creatures to attack (removing defenders), giving you more time to set up the board (removing attackers/expensive creatures), and allow for combat tricks (saving your creatures after damage is on the stack
You cannot achieve greatness if its seed has not already been planted in your heart. Illustrated by Aaron Miller Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
For the purposes of format legality, deck construction, game rules, and effects, these cards have only the card name specified in the secondary title bar, says WotC's official Final Fantasy Release Notes
Whenever this creature attacks, you may sacrifice another creature or artifact