what happens if other player has Veiled Sentry and I cast a creeping mold on it?
what happens if other player has Veiled Sentry and I cast a creeping mold on it?
The Sentry's ability triggers and goes on the stack on top of Creeping Mold. The ability resolves and turns the Sentry into a creature. When Creeping Mold tried to resolve, it sees that its only target is now illegal, so it gets countered.
Fluttershy is best pony.
If instead I cast a Banishment Decree, it would still affect it even though it changed to a different type of permanent between casting and resolving, right?
Yes, that would work.
Fluttershy is best pony.