Temporai the wild assasin

first strike.
When temporei attack all player`s
exile a card from
the libaryand give it to you. you can play it
for {0} mana cost.
{1}{r}: All creatures you control gain first strike
until end of turn.
{r/g}{r/g}{r/g} You make a 2/2 elf.
{x}{g} You gain {x} life.