Sliver Architect

{b/g}{5} - Every Sliver is indestructible.
{b/r}{5} - Every Sliver gets a +3/+3 counter.
{g/u}{5} - Every creature is a sliver in addition to its
other types.
If the total power of all slivers is 66 or above,
you win the game.
—
It seems that fate doesn't come
without a sense of irony.