Katherine, The Insatiable Mind

Lifelink
Whenever you gain life, untap up to three target
non-land permanents you control. If you have 30
or more life, they gain indestructible until end of
turn.
{1}{w}: Put a +1/+1 counter on target creature you
control.
{2}{w}{w}, {t}: All creatures you control gain lifelink
and +0/+3 until end of turn.