Imlerith of The Wild Hunt

When Imlerith of The Wild Hunt enters the battlefield, create X 2/2 blue Hound creature
tokens.
Can only use one ability per turn:
{u}: Imlerith of The Wild Hunt gets -1/+3 and hexproof until end of turn.
{b}: Imlerith of The Wild Hunt gets +3/-1 and
trample until end of turn.