Yellow and Blue Diamond

Trample, Vigillance, Fear, Double Stike
Kindergartens you control have "{t}: Create a copy
of 2 target worker gems you control."
{p/u}, Tap an untapped blue gem you control: Tap
target creature.
{p/r}, Tap an untapped red gem you control: Put A
+1/+1 Counter on target gem.
{t}, Tap 15 untapped gems you control: Gain control
of two target lands. They become Kindergartens.
It's owner loses 10 life.