Maybe you know them, maybe you don’t. We don’t get any money for relinking these sites, we aren’t in any relationship with these sites, we just recommend them to you as fellow magic players. There are hundreds of websites which are about MTG, but these shine out:
Wizards of the Coast : Magic the Gathering – the official Site – no more description needed.
Wizards of the Coast : Gather – the official Search Engine Maybe not that easy and intuitive to use, but hey, it is official.
Magic The Gathering Wiki – want to know what a Zoo Deck is or you don’t know what Political Magic stands for ? Look it up here.
Scryfall – a powerful Search Engine. If you are looking for cool additions for your deck, it’s always useful to have a look at Scryfall.
Duelcommander – also called French Commander. A resource for 1vs1 Singleton games with a 20 lifepool and no Commander damage.
Leviathan Commander. A back to the roots version of Duelcommander – the resource for 1vs1 Commander games with a 30 lifepool.
MTG Commander – the official Site for political free-for-all Commander play including best examples for the Deckbuilding rules.
EDH Rec – great website for sample decklists, basic card recommendations and stats.
Magickartenmarkt – the biggest Marketplace to buy Magic cards within Germany (Europe?)
MTGSalvation – great Forums, including Spoiler Lists, Commander Deck lists and the like.
Mythicspoiler – If you are the one who likes to know what comes next, you should step by here sometimes.