Before and After
Rulings
Vanilla Monsters
What type am I
Who Said It
100
Kaiba's Ace Monster | Pegasus's trap to seal it away
Blue Eyes White Dragon Capture Jar
100
In older Yugioh, only one of these types of cards could be active at once.
Field Spells
100
The ultimate wizard in terms of attack and defense.
Dark Magician
100
Gravekeeper's Guard 
Spellcaster
100
"My Grandpa's Deck has no Pathetic Cards"
Yami Yugi
200
On flip this monster can draw you and your opponent 5 cards | Trap card that draws 1 card
Morphing Jar of Greed
200
Only damage modification and cards that negate activation can be used in this part of the Battle Phase
Damage Step
200
This legendary dragon is a powerful engine of destruction. Virtually invincible, very few have faced this awesome creature and lived to tell the tale.
Blue-Eyes White Dragon 
200
Vorse Raider 
Beast-Warrior
200
“Yug!” "Man did I miss this spikey little head!"
Joey Wheeler
300
Spell card to destroy the highest Defense | Continuous spell to lockdown 2 of your opponent's zones
Smashing Ground Collapse
300
This old rule was the reason for many duelists to choose 1st if they won the coin flip.
Draw for the first turn
300
A ferocious dragon with a deadly attack.
Red-Eyes Black Dragon 
300
Ash Blossom and Joyous Spring
Zombie
300
"I'll throw down a face-down!"
Jaden Yuki
400
Daily Double
Junk Warrior of Atlantis
400
Card with the formatting, When x, you can y are notorious for failing to activate because of this.
Missing the Timing
400
With its sound-baffling armor and gargantuan jaws, this primeval predator's phosphorescence was the only possible pardon for its primitive prey.
Megalosmasher X
400
Dunames Dark Witch 
Fairy
400
"Let's rev it up"
Yusei Fudo
500
Spell to flip a monster face down | Annoying Equip spell in limited
Book of Moon Mirror Shield
500
A massive change during the XYZ era, what do you mean you can activate your effect before I can respond, I had dibs!
Ignition Effect Priority
500
The proudust of them all.
White Duston 
500
Ojama Yellow 
Beast
500
“I see you can count. However, numbers aren’t everything.”
Seto Kaiba