Match strategy to strengths (combat math, patience, macro planning) and avoid styles that exploit your weaknesses (e.g., super-mathy combo turns) unless you can practice enough to offset them
The other three mana sweepers dont cleanly handle everything the way Clarion does, and like I said before once you start asking about four, five, or six mana its too easy for your opponent to come out under your sweeper and punish you for tapping out
However, you dont see this card so much in the Standard meta at the moment because of the high cost of its activated ability and just the sheer amount of cheap removal available
This is a somewhat controversial question to answer
From a Regular Plus 1 Pack From a Rare Pack Not available in a Rare Pack
(Source) Lets take a look at The Dark