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If you play a common deck or a deck with a common theme it's easier for your opponent make correct decisions.

Say I've played against your "Goblin deck" a lot of times. I know what are your most dangerous threats, what creatures I want to kill, what spells I want to counter, how long I should wait before I play my sweeper, what your kill range is, and so on.

So say you bring a deck I've never seen before, and play a bunch of cards I've never played against, I have a harder time to make optimal decisions against you. Does heDo you win by milling or damage? Is heAre you searching for a combo? What's hisyour kill range? Do I want to counter this spell or should I save the counter for hisyour next one? Can I risk playing a creature here?

To summarize, playing an unknown deck/playstyle/wincon will give you an information advantage (unless your opponent does too) to base you decisions on.

If you play a common deck or a deck with a common theme it's easier for your opponent make correct decisions.

Say I've played against your "Goblin deck" a lot of times. I know what are your most dangerous threats, what creatures I want to kill, what spells I want to counter, how long I should wait before I play my sweeper, what your kill range is, and so on.

So say you bring a deck I've never seen before, and play a bunch of cards I've never played against, I have a harder time to make optimal decisions against you. Does he win by milling or damage? Is he searching for a combo? What's his kill range? Do I want to counter this spell or should I save the counter for his next one? Can I risk playing a creature here?

To summarize, playing an unknown deck/playstyle/wincon will give you an information advantage (unless your opponent does too) to base you decisions on.

If you play a common deck or a deck with a common theme it's easier for your opponent make correct decisions.

Say I've played against your "Goblin deck" a lot of times. I know what are your most dangerous threats, what creatures I want to kill, what spells I want to counter, how long I should wait before I play my sweeper, what your kill range is, and so on.

So say you bring a deck I've never seen before, and play a bunch of cards I've never played against, I have a harder time to make optimal decisions against you. Do you win by milling or damage? Are you searching for a combo? What's your kill range? Do I want to counter this spell or should I save the counter for your next one? Can I risk playing a creature here?

To summarize, playing an unknown deck/playstyle/wincon will give you an information advantage (unless your opponent does too) to base you decisions on.

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source | link

If you play a common deck or a deck with a common theme it's easier for your opponent make correct decisions.

Say I've played against your "Goblin deck" a lot of times. I know what are your most dangerous threats, what creatures I want to kill, what spells I want to counter, how long I should wait before I play my sweeper, what your kill range is, and so on.

So say you bring a deck I've never seen before, and play a bunch of cards I've never played against, I have a harder time to make optimal decisions against you. Does he win by milling or damage? Is he searching for a combo? What's his kill range? Do I want to counter this spell or should I save the counter for his next one? Can I risk playing a creature here?

To summarize, playing an unknown deck/playstyle/wincon will give you an information advantage (unless your opponent does too) to base you decisions on.