I'm Singing in the Rain

When you play this card, choose one:
-X creatures you control gain Islandwalk
-X artifacts or enchantments you control
gain Hexproof
-Enchant land. It gains: "{t}: add X{u}, where
X is the mana used to cast Singing in the Rain."
"I'm singing in the rain, I'm singing in the rain,
after all that work and pain, I'm just slipping, in the
rain" {dash}Singing in the Rain, the Musical