The Uncle

At the beginning of your upkeep, if you control a
niece or nephew creature, you may put a +1/+1 counter on The Uncle.
The Uncle's power and thoughness are equal to
the number of niece or/and nephew you control.
{t}: put a +1/+1 counter on target niece or
nephew and you gain 1 life.
—
Softer that it looks, tricky to endure,
guaranteed to last