Defect is strongest when the deck creates a machine: orbs do work every turn, powers improve the machine, and draw finds the right pieces before the fight gets out of control.
Balance orbs and direct answers
Lightning and frost can carry fights, but early decks still need direct damage or block when the orb setup is slow.
Focus is premium scaling
Focus improves many turns at once. When your deck already channels enough orbs, focus can be better than another medium attack.
Powers need time
Power-heavy decks are excellent in long fights but can stumble against fast enemies. Add enough early tempo to survive the setup turns.