Leif, Ardnnea's Chosen

Flying, Vigilance
At the beginning of each upkeep, Populate
{1}{r}: Leif, Ardnnea's Chosen gets +1/+0 until
end of turn.
{x}{g}, {t}, Distribute X +1/+1 counters among
any number of creatures.
{t}, Sacrifice Leif, Ardnnea's Chosen. You gain
life equal to it's toughness. Return it to your
hand at the beginning of the next end step.