Kenni The Legend

At the beginning of each end step, add {w} if you
gained 5 or more life this turn, {u} if you drew 1
or more cards this turn, {b} if 1 or more creatures
died this turn, {r} if an opponent lost 5 or more
life this turn, and {g} if a creature with power 4 or greater entered or left the battlefield under your control this turn. Until your next end step, this
mana does not leave your mana pool as steps and
phases end.