The Abyss, hell incarnate

{w} creatures have hexproof.
{u} spells cost {1} less to cast.
{b} spells give you 1 life.
{r} creatures have first strike.
{g} creatures have exalted.
—Every time you would loose life, you loose that
much plus 2 life instead. Spells cost {1}{x}{x} more
to cast. After casting a spell you gain life equal to
half of X, rounded up.