Wyntelle the De-scripter

Flying, protection from all colors
Whenever a player casts a colorless spell,
Wyntelle the De-scripter gets +X/+X and
another target creature gets -X/-X until end of
turn, where X is equal to that spell's converted
mana cost.
{w}{u}{b}, {t}: Destroy all creatures with power 3
or less, then each player draws cards equal to the number of creatures that left the battlefield
this turn.