It is worth around $30. It is an ultra good card and is very rare to find.
10 cent piece
The one from the tin? A few £, maybe.
Marshmallon has a Trigger Effect that deals damage and a continuous effect that prevents it from being destroyed by battle. If a face-down Marshmallon is attacked, it will first be flipped face-up. You will then calculate damage - unless LaDD's ATK has been reduced severely, more than likely no damage will be dealt. If LaDD's attack is higher, it doesn't matter as Marshmallon cannot be destroyed by battle. Marshmallon's effect will then trigger, Light and Darkness Dragon will chain to it and negate it, so no damage is dealt. Note that Light and Darkness Dragon does not destroy the cards he negates, so Marshmallon will remain on the field. Also note that Light and Darkness Dragon can do nothing to continuous effects as they do not 'activate'. That means he can do nothing against Marshmallon's battle protection.
Well,if it's in the box it's probably worth about 225$
On Amazon you can get a used one for 45 pounds, a new one would cost £59.99
one million dollars
The Elemental Hero Bladedge Yugioh card is worth approximately $1. The price of the Yugioh card will vary depending upon its condition.
10 cent piece
Forbidden Chalice will negate Marshamallon's 'cannot be destroyed by battle' effect. Because Forbidden Chalice changes the ATK of a monster, it can be used in the Damage Step, after Marshmallon is flipped by an attack. If you did this, you will not take the 1000 damage from Marshmallon either - his damage dealing effect activates after Damage Calculation, but will be negated.
it is not very rare, but I heard it is sold for 2 bucks
Around 18-25 US cents.
Depends what the cards are. Some are worth a lot, some are almost worthless.
blue eyes white dragon is worth $4.50- $6.00 depending on which version.
You can find "Marshmallon" in the booster pack Duelist Pack Yugi.
It depends if it's a holo or common. If it's a common, it's really only worth about 25 cents.
The one from the tin? A few £, maybe.
it depends on its condition and rarity but normally i think around $5