Simic Mutant Arena

{t}: add {g}{u}
{g}{u}{t}: Put a +1/+1 counter on target creature, it fights another target creature. It becomes a
mutant in addition to its other types.
{u}{u}{g}{g}{t}: create a */*, Mutant creature token,
its power is equal to the number of creatures you control, and its toughness is equal to the number
of players.
{u}{u}{g}{g}{t}: Put a +1/+1 counter on each
Mutant you control