Rain of Arturos

At the beginning of your upkeep, put an Influence Counter on Rain of Arturos.
{1}{w}{t}: Target player gains X life, where X is the number of Influence Counters on Rain of Arturos.
{1}{b}{t}: X target creatures get -1/-1, where X is the number of Influence Counters on Rain of Arturos.
{1}{g}{t}: X target creatures get +1/+1, where X is the number of Influence Counters on Rain of Arturos.