Shield of Duty and Reason
Enchantment — Aura
Enchant creature
Enchanted creature has protection from green and from blue.
- CMC
- 1
- Mana cost
- Color identity
- W
- Rarity
- common
- Set
- Apocalypse
- Price
- $0.43
- EDHREC rank
- #10504
Shield of Duty and Reason puts protection from white and protection from black on a creature for zero mana — that's evasion and targeted removal insurance stapled together at no cost. In Light-Paws, Emperor's Voice decks, it's essentially a free tutor trigger, and that makes it an auto-include rather than a fringe option.
Best Commanders
Commanders with the highest synergy
Light-Paws, Emperor's Voice
Light-Paws, Emperor's Voice triggers on any Aura cast targeting a creature you control, and Shield of Duty and Reason costs zero — so you're getting a free Aura chain link that also makes your Fox commander harder to kill and easier to connect with.
Pearl-Ear, Imperial Advisor
Pearl-Ear, Imperial Advisor cares about Foxes and puts Auras to work in a similar white-based tempo shell, and Shield of Duty and Reason earns its slot there the same way: free protection that also fuels any cast-trigger payoffs in the 99.
Format Analysis
Where it lives, where it can’t
| Format | Verdict |
|---|---|
| commander | legal |
| legacy | legal |
| modern | not legal |
| pioneer | not legal |
| standard | not legal |
| vintage | legal |
| pauper | legal |
| oathbreaker | legal |
Commander is where Shield of Duty and Reason actually matters, and only in Aura-centric decks — outside of Light-Paws, Emperor's Voice, the protection rarely justifies a deck slot. In Pauper it's legal and the zero mana cost is real, but protection from white and black covers only two of the five colors, which limits its utility as a combat trick or protection piece. Legacy and Vintage have access to it, but neither format has a shell that wants a zero-mana Aura for its own sake — it would need a broken cast trigger to matter, and those shells don't exist at competitive tables.
Key Combos
Combo lines featuring this card
Price Context
Current price
$0.43 bulk tier
At $0.43, Shield of Duty and Reason is bulk — you're not paying for the card, you're paying for postage. It's a stable bulk rare that won't spike and doesn't need to; anyone playing it already knows exactly what deck it goes in.
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Sources
Updated . Data from Scryfall, EDHREC, and Commander Spellbook.