Georg, the Bögerlous Bastion

Vigilance, Lifelink
Whenever you gain life, put a +1/+1 counter on
each creature you control.
{t}, Pay {x} life: Until end of turn, target creature
gets +{x}/+{x}, where X is the life paid this way.
Sacrifice another creature: You gain life equal to
the sacrificed creature's toughness. Activate this
ability only any time you could cast a sorcery.