The Pokmon VMAX this card is attached to gets -100 HP, and if it is Knocked Out by damage from an attack from your opponents Pokmon, that player takes 1 fewer Prize card
For example, the Time Wizard can destroy all the monsters on either side of the field depending on its roulette result, dice-themed cards can multiply one of his monster's attack values or divide an enemy monster's attack values, and another card makes an enemy monster randomly attack a monster on either side of the field
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Having a card thats incredibly good in Limited is usually a sign that it will be good enough for Constructed as well, although its not always the case
They can help you get more insight into drafting, what choices to make, and become a better player overall
If it's your Commander, ideally you'll want to bounce a blocker, horsemanship is cheap online, and then equip with a haste giving piece of equipment like Lightning Greaves, and then swing