Your umbrella won't help you here as these rain drops contain lightning. The card's info says:
Target 1 face-up "My Luminous Pony" monster you control; destroy all face-up monsters your opponent controls, and if you do, that target cannot attack this turn, also halve all Battle Damage your opponent takes this turn. You can only activate 1 "Lightning Shower" per turn.
1 week, 3 days ago
09 Jan 2017 22:39 CET
Full Size: 25b77d7d08db6d0be2f56eff7f15ecfb