Ok I noticed that you have this lessons/class room banner and almost no one has posted in it so I've taken the liberty to post a lesson on here
Ok so lesson 1:
Hello CNA and thank you for coming to class today! Todays lesson is on
Mandatory Effects Now not all effects in yugioh are manditory for instance Gorz the Emissary of Darkness can anyone tell me why his effect is not mandatory? Yes you in the back! Yes! Thank you for all of you who where to busy talking to your neighbors *cough cough luster cough cough* heres what he said. Gorz's effect is not mandatory because it has the words "You Can"
- Spoiler:
When you take damage from a card your opponent controls: You can Special Summon this card from your hand. You must control no cards to activate and to resolve this effect. When Special Summoned this way, activate the appropriate effect, based on the type of damage.
● Battle Damage: Special Summon 1 "Emissary of Darkness Token" (Fairy-Type/LIGHT/Level 7/ATK ?/DEF ?). Its ATK and DEF are each equal to the amount of Battle Damage you took.
● Effect Damage: Inflict damage to your opponent equal to the amount of damage you took.
Now because of the way its worded you have the choice to summon him or to not summon him. Now to spot a mandatory effect Heres what you'd be looking for: When this card is sent to the grave yard add one spell/trap card to your hand, or When this card is sent to the grave yard banish one dark monster to special summon a light monster in defense, now of course these cards aren't real lol. But the way they are worded shows that it must happen. Now if the effects looked some thing like this When this card is sent to the grave yard you
can add one spell/trap card to your hand. The key word in that effect is
"can" because it indicates that you can choose not to activate the effect. Yea if you guys liked this then I will definitely do another one!
by 
Subject: OK well lets go for it 
