*Ratings below are based on when the Deck was released and NOT today's Yu-Gi-Oh format*
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Champion Pack: Game One (CP01-EN) Card Ratings

1. Card gallery: https://yugipedia.com/wiki/Set_Card_Galleries:Champion_Pack:_Game_One_(TCG-EN-UE
Game One (CP01-EN020)
Threatening Roar
TRAP / Normal Trap
Your opponent cannot declare an attack this turn.
(Common)
Rating: 3 out of 5
No waiting once your opponent's turn starts, and no activation requirements either.
Game One (CP01-EN019)
Emissary of the Afterlife
DARK / Effect Monster / Level 4 / ATK 1600 / DEF 600
(Fiend / Effect)

When this card is sent from the field to the Graveyard, each player selects 1 Level 3 or lower Normal Monster from their Deck, and adds it to their hand after showing it to the opponent. The Decks are then shuffled.
(Common)
Rating: 2 out of 5
Pretty much limited to Exodia (#137) Decks.
Game One (CP01-EN018)
Stealth Bird
DARK / Effect Monster / Level 3 / ATK 700 / DEF 1700
(Winged Beast / Effect)

Once per turn, during your Main Phase, you can flip this card into face-down Defense Position. When this card is Flip Summoned, inflict 1000 damage to your opponent.
(Common)
Rating: 1 out of 5
You're more likely to deal 1000 damage using Meteor of Destruction. (#41)
Game One (CP01-EN017)
Mudora
EARTH / Effect Monster / Level 4 / ATK 1500 / DEF 1800
(Fairy / Effect)

This card gains 200 ATK for every Fairy-Type monster in your Graveyard.
(Common)
Rating: 2 out of 5
Same stats as Gamma the Magnet Warrior, and with a pretty insignificant effect.
Game One (CP01-EN016)
Final Countdown
SPELL / Normal Spell
Pay 2000 Life Points. After 20 turns have passed (counting the turn you activate this card as the 1st turn), you win the Duel.
(Common)
Rating: 2 out of 5
The Duel comes down to 20 turns, but you're already down 2000 Life Points just to activate this card.
Game One (CP01-EN015)
My Body as a Shield
SPELL / Quick-Play Spell
When your opponent activates a card that has an effect which destroys 1 or more monster(s) on the field, pay 1500 Life Points to negate the activation of that card and destroy it.
(Common)
Rating: 1 out of 5
Such a high fee, and there are very few cards left that could even be countered by this.
Game One (CP01-EN014)
King Tiger Wanghu
EARTH / Effect Monster / Level 4 / ATK 1700 / DEF 1000
(Beast / Effect)

Destroy all monsters with an ATK equal to 1400 or less that are Normal Summoned or Special Summoned.
(Common)
Rating: 1 out of 5
Set them and you avoid the effect, though most are terrible.
Game One (CP01-EN013)
Mysterious Guard
EARTH / Effect Monster / Level 3 / ATK 800 / DEF 1200
(Spellcaster / Flip / Effect)

FLIP: Return 1 face-up monster on the field to the top of its owner's Deck. Also, if there is a face-up Warrior-Type monster on your side of the field, you can return another face-up monster to its owner's hand.
(Common)
Rating: 1 out of 5
Penguin Soldier (#22) can return up to 2 monsters to the hand regardless of Type.
Game One (CP01-EN012)
Thunder Kid
WIND / Normal Monster / Level 2 / ATK 700 / DEF 600
(Thunder / Normal)

This monster stores electricity within his body, and can unleash it with catastrophic power.
(Common)
Rating: 1 out of 5
So does Pikachu, and delivers more power as a result.
Game One (CP01-EN011)
Pot of Avarice
SPELL / Normal Spell
Select 5 Monster Cards from your Graveyard, then add them to your Deck and shuffle it. After that, draw 2 cards.
(Rare)
Rating: 3 out of 5
Quite a few Decks can benefit with this.
Game One (CP01-EN010)
Enemy Controller
SPELL / Quick-Play Spell
Select and activate 1 of these effects:
● Change the battle position of 1 face-up monster on your opponent's side of the field.
● Tribute 1 monster. Select 1 face-up monster on your opponent's side of the field. Take control of the selected card until the end of this turn.
(Rare)
Rating: 2 out of 5
Block Attack (#31) and Change of Heart combine into a relatively useful card.
Game One (CP01-EN009)
Reflect Bounder
LIGHT / Effect Monster / Level 4 / ATK 1700 / DEF 1000
(Machine / Effect)

When this face-up Attack Position card is attacked by an opponent's monster, before damage calculation, this card inflicts damage to your opponent equal to the ATK of attacking monster. Then, after damage calculation is resolved, this card is destroyed.
(Rare)
Rating: 1 out of 5
So far, I'm seeing little merit for calling it a Champion Pack.
Game One (CP01-EN008)
Solemn Judgment
TRAP / Counter Trap
Pay half your Life Points. Negate the activation of a Spell / Trap Card / Normal Summon / Flip Summon / Special Summon and destroy the Spell Card, Trap Card, or Summoned monster.
(Rare)
Rating: 2 out of 5
Costly, but could negates just about anything. Most of the big cards worth negating are gone though.
Game One (CP01-EN007)
Limiter Removal
SPELL / Quick-Play Spell
Double the ATK of all face-up Machine-Type monsters on your side of the field, until the end of this turn. During the End Phase, destroy all monsters that were affected by this effect.
(Rare)
Rating: 2 out of 5
Better make your attack(s) count or you're probably losing the Duel next turn.
Game One (CP01-EN006)
Big Shield Gardna
EARTH / Effect Monster / Level 4 / ATK 100 / DEF 2600
(Warrior / Effect)

Negate the activation of any Spell Card that targets this 1 face-down monster. At that time, flip this card into face-up Defense Position. If this card is attacked, change it to Attack Position at the end of the Damage Step.
(Rare)
Rating: 2 out of 5
Said shield is only likely up for a single turn, but the other effect is marginally useful.
Game One (CP01-EN005)
Night Assailant
DARK / Effect Monster / Level 3 / ATK 200 / DEF 500
(Fiend / Flip / Effect)

FLIP: Select 1 monster on your opponent's side of the field and destroy it. When this card is sent directly from your hand to the Graveyard, return 1 Flip Effect Monster from your Graveyard to your hand.
(Super Rare)
Rating: 2 out of 5
One copy can get the other one back, or any other good Flip Effect monster. Otherwise, it's mediocre.
Game One (CP01-EN004)
Sakuretsu Armor
TRAP / Normal Trap
Activate only when your opponent declares an attack. Destroy the attacking monster.
(Super Rare)
Rating: 2 out of 5
I don't get making cards foil if they're not good in the first place.
Game One (CP01-EN003)
Metamorphosis
SPELL / Normal Spell
Tribute 1 monster. Special Summon 1 Fusion Monster from your Fusion Deck with the same Level as the Tributed monster.
(Super Rare)
Rating: 1 out of 5
The Spell Card version of Summoner of Illusions (#4), but is just as useless.
Game One (CP01-EN002)
Book of Moon
SPELL / Quick-Play Spell
Flip 1 face-up monster on the field into face-down Defense Position.
(Super Rare)
Rating: 2 out of 5
Often puts monsters in a vulnerable position and can reset Flip Effect (#46) monsters.
Game One (CP01-EN001)
Satellite Cannon
LIGHT / Effect Monster / Level 5 / ATK 0 / DEF 0
(Machine / Effect)

This card cannot be destroyed by battle with a Level 7 or lower monster. During each of your End Phases, this card gains 1000 ATK. If this card attacks, its ATK is returned to 0, after damage calculation.
(Ultra Rare)
Rating: 2 out of 5
It's either Set it and survive most attacks or Summon it and risk heavy damage each turn.