Hexproof is a keyword ability. Something with hexproof cannot be the target of spells or abilities your opponents control. Note that if you control a creature with hexproof, and then an opponent gains control of it, you can't target it anymore.
No, Riot does not stack in Magic: The Gathering.
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.
"Valakut" is a land card in Magic: The Gathering.
No, a creature is not considered a spell in Magic: The Gathering.
No, a planeswalker is not considered a creature in Magic: The Gathering.
No, a planeswalker is not considered a spell in Magic: The Gathering.
Yes, creatures are considered permanents in Magic: The Gathering.
No, lands do not have summoning sickness in Magic: The Gathering.