Yuan-Ti ScaleshieldHow it works & interactions with other cards

Comprehensive Protection

When you cast Yuan-Ti Scaleshield, every permanent you currently control on the battlefield gains both hexproof and indestructible. Hexproof prevents your opponents from targeting your permanents with spells or abilities, while indestructible ensures they cannot be destroyed by damage or effects that say 'destroy.' This effect lasts until the end of the current turn, though it only applies to permanents you controlled at the moment the spell resolved.

Seeking Reinforcements

The second part of the spell is a conditional trigger that checks the history of the turn. If an opponent has cast at least one spell with a mana value of 3 or less at any point before Yuan-Ti Scaleshield resolves, you 'Seek' a creature card. To Seek means the game automatically pulls a random creature card from your library and puts it into your hand. This does not shuffle your library because you are not searching it; the game simply identifies a valid card and gives it to you.

Common Pitfalls

A common mistake is thinking this spell protects permanents that enter the battlefield later in the turn; it does not. The set of permanents affected is determined solely when the spell resolves. Additionally, remember that indestructible does not prevent a permanent from being exiled, sacrificed, or having its toughness reduced to zero or less. Finally, the 'Seek' condition tracks the mana value of the spell as it existed on the stack, not the amount of mana actually paid for it.

Interaction examples

Countering Removal

Beast Within

Step 1: Your opponent casts Beast Within targeting your favorite enchantment. Step 2: In response, you cast Yuan-Ti Scaleshield. Step 3: Yuan-Ti Scaleshield resolves first, giving your enchantment hexproof and indestructible. Step 4: Beast Within tries to resolve, but its target is now illegal due to hexproof, so the spell is pack-fizzled and removed from the stack with no effect.

Comparing Protective Values

Heroic Intervention

While both Heroic Intervention and Yuan-Ti Scaleshield provide the exact same keywords (hexproof and indestructible) to your board, Yuan-Ti Scaleshield offers superior value in Alchemy or Historic formats. If your opponent previously cast a cheap spell like a mana dork or a cantrip, Scaleshield replaces itself by Seeking a creature, whereas Heroic Intervention would leave you with one less card in hand.

Surviving Board Wipes

If an opponent casts a spell that says 'Destroy all creatures,' you can cast Yuan-Ti Scaleshield in response. Because your creatures gain indestructible, the destruction effect will fail to remove them. If that board wipe cost 3 or less mana, you also get to Seek a creature card, ensuring you have a follow-up play for the next turn.