The Wandering Minstrel's second ability checks at the moment it would trigger to see if you control five or more Towns. If you don't, the ability won't trigger at all. If it does trigger, the ability will check again as it tries to resolve. If you don't control five or more Towns at that time, the ability won't resolve and none of its effects will happen.
The Wandering Minstrel
If The Wandering Minstrel would enter the battlefield at the same time a land you control would enter the battlefield tapped, that land still enters the battlefield tapped.
The value of X is calculated only once, as The Wandering Minstrel's last ability resolves.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Thanh Tuấn
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