Depends maybe on your main character class. Personally I'd get Doppelganger because rogue and BS are both melee based. Kaho is nonetheless a decent idea as it's a good gear for pretty much all classes, it's more INT STR and DEX based though, so meaning more magic class based than melee. A single Doppelganger card is by far way cheaper than a Kaho, even if you were to buy three it'd still be cheaper.If you were looking for instant cast for magic, you'd still require other gears to complete the 150 dex. For Doppelganger, you'd still need other card combinations to combine together a good weapon- but the weapon may be limited to a certain class. So it depends on you really.