Do dual lands count as islands?
Yes, your Tropical Island counts as both an Island and a Forest HOWEVER it is in no way a basic land.
Are dual lands restricted?
To preserve Magic’s greatest competitive constructed format, the ten original dual lands must be banned from its greatest casual format. Last week, Star City Games announced that Legacy would be replaced by Pioneer in its popular SCG Tour tournament series.

What MTG set has dual lands?
Magic 2010 was the first core set (outside of Alpha/Beta) to create new cards, among them a new ally dual-land cycle. This cycle enters the battlefield tapped unless you control one of the two basic lands connected to the land’s colors.
Are dual lands both land types?
Ravnica dual lands count as both basic land types, and sometimes that can be as valuable as the mana they produce.
How many revised dual lands are there?
Other than that, here’s the full list of reprints for all 10 original duals: Limited Edition Alpha. Limited Edition Beta. Unlimited Edition.

How many dual lands can you have in a Commander deck?
As a general rule of thumb, you want somewhere between 33 and 42 lands in a Commander deck. Naturally, you want as many special lands as you can find. Lands that generate more than one colour of mana or that have special abilities are always a great shout.
Why are dual lands so expensive MTG?
Because almost all decks use land, and in legacy, the format that can use these lands is heavy blue, the original blue dual lands are pretty expensive. They each serve different purposes. Only the original dual lands, the shock lands, and the new battle for zendikar lands have both the land types.
Are dual lands considered basic?
Why are the original dual lands so expensive?
Dual lands are the most powerful cards in Magic: The Gathering. They can be played as both a land and a spell, which means they have the ability to tap for mana without having to pay any costs. This makes them very valuable and hard to find, so they are often sold for high prices on the market.