wotc
If the land this Aura would enchant is an illegal target by the time New Horizons resolves, the entire spell doesn't resolve. It won't enter the battlefield, so its ability won't trigger.
If the land this Aura would enchant is an illegal target by the time New Horizons resolves, the entire spell doesn't resolve. It won't enter the battlefield, so its ability won't trigger.
You can cast New Horizons even if you control no creatures.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Noah Bradley
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