It is unlikely for wards to thematically fit every element.
Since they're counters, you could just do anti-opposite. Examples:
Aether: Both decks cannot be changed from when your opponent draws to when your opponent ends his turn. Theme: Unchanging.
Air: Your pillars cannot be destroyed. Removes delay on all creatures when played. Theme: Freedom.
Darkness: If the opponent is protected by Sanctuary, Devourers generate
each turn and Nightmare drains 2 HP per empty space in enemy hand. Theme: Subterfuge/Self-deception
Death: Each turn, any creature summoned after the first dies when summoned. Theme: Death.
Earth: All airborne creatures are treated as non-airborne creatures. Theme: Grounding.
Entropy: Whenever you gain 12 quanta, protect yourself from quanta disruption and creature damage for 1 turn. Theme: ...