'Blistering Firecat' has long since rotated out of Standard format, but it has in no way ever been 'banned', and it can freely be used in any format that allows Onslaught-block cards.
No, Skullclamp is currently banned in all formats of Magic: The Gathering.
Complete banned lists are available here: http://www.wizards.com/Magic/Magazine/Article.aspx?x=judge/resources/banned
As of the current Magic: The Gathering rules, Cathars' Crusade is a legal card that can be played in the game. It is not banned or restricted in any format.
Magic the Gathering has many formats, each with it's own list of legal cards. To see a complete list see here: http://www.wizards.com/Magic/Magazine/Article.aspx?x=judge/resources/banned
As of the latest Magic: The Gathering set, Omnath, Locus of Creation has been banned in Standard format due to its powerful and dominating presence in the game.
No, Riot does not stack in Magic: The Gathering.
The official ruling on the Nexus of Fate card in the current Magic: The Gathering tournament format is that it is banned in Standard and Historic formats, but legal in other formats like Commander.
Magic the Gathering is not a cult. It is a collectible card game.
An open-minded Christian will have no issues with Magic the Gathering.
Yes, in Magic: The Gathering, a commander can be exiled.
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There are over 20,000 different cards in Magic: The Gathering.