add some logic so intervals for unknown cards stay within a certain range
add some logic so intervals for unknown cards stay within a certain range

bmaupin/junkpile,bmaupin/junkpile,bmaupin/junkpile,bmaupin/junkpile,bmaupin/junkpile,bmaupin/junkpile,bmaupin/junkpile,bmaupin/junkpile,bmaupin/junkpile