Thieren, Guildmage of Ravnica

This spell can't be countered.
{u}{u}{2}: Counter target spell or ability.
Activate this ability only once per turn.
{w/u}{2}: Create a 1/1 white and blue wizard token
with hexproof. Until end of turn all creatures you
control gain hexproof.
{g}{g}{1}{t}: Prevent all damage that would be
dealt this turn.
Those who use the arcane arts agressively
tend to lose themselves in the process.
-Theiren, Guildmage of Ravnica