Bart, Master of Spreadsheets

Vigilance, Lifelink
Data Analysis {2},{t}: You may pay X and tap an untapped creature you control with power X or greater. If you do, draw cards equal to the power
of the tapped creature.
Sustainable Growth {t}: At the beginning of your upkeep, put a growth counter on target creature
you control. If you do, put a +1/+1 counter on
each creature you control with a growth counter
on it.