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Enchant land
When New Horizons enters the battlefield, put a +1/+1 counter on target creature you control.
Enchanted land has "{T}: Add two mana of any one color."
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.
