Security Blockade
Enchantment — Aura
Oracle Text
Enchant land When this Aura enters, create a 2/2 white Knight creature token with vigilance. Enchanted land has "Rules for this card
Rulings (1)
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Wizards of the CoastYou must target a land to cast Security Blockade. If that land is an illegal target when Security Blockade tries to resolve, it won't resolve and won't enter. You won't get the Knight token.