Pact with the Serpent

Create a 3/3 blue Serpent creature token,
then you may have it gain indestructible
until end of turn. When you don't, tap
target permanent. Its activated abilities
can't be activated this turn unless they're
mana abilities.
At the beginning of your next upkeep, pay {2}{g}{u}. If you don't, you lose the game.
///Easter Egg challenge:Create a sorcery with mana cost {a}{a}{a}{b}{b}{b}, where {a},{b} are different and are from {w}{u}{b}{r}{g}.
e.g. {g}{g}{g}{u}{u}{u}