Core Surge is a card for the Defect that deals 11 (15) damage and grants 1 Artifact buff. While this card is not particularly useful on its own (although it can be valuable, when drawn at the right time, to negate key debuffs) it is excellent for setting up combos with certain other cards. Two cards which work particularly well for it are Biased Cognition and Hyper-Beam, both of which have their downsides negated if Core Surge is used first.

Defect Cards
Attacks All for OneBall LightningBarrageBeam CellBlizzardBullseyeClawCold SnapCompile DriverCore SurgeDoom and GloomFTLGo for the EyesHyperbeamMelterMeteor StrikeReboundRip and TearScrapeStreamlineStrikeSunderSweeping BeamThunder Strike
Skills AggregateAmplifyAuto-ShieldsBoot SequenceChaosCharge BatteryChillConsumeCoolheadedDarknessDefend (Defect)Double EnergyDualcastEquilibriumFissionForce FieldFusionGenetic AlgorithmGlacierHologramLeapMulti-CastOverclockRainbowRebootRecursionRecycleReinforced BodyReprogramSeekSkimStackSteam BarrierTURBOTempestWhite NoiseZap
Powers Biased CognitionBufferCapacitorCreative AIDefragmentEcho FormElectrodynamicsHeatsinksHello WorldLoopMachine LearningSelf RepairStatic DischargeStorm