Unsustainable Growth

Double the power and toughness of all creatures
you control.
Monstrosity- If you control a creature with power
four or more, triple the power and toughness of
all creatures you control instead, then give all
creatures you control trample.
Fateful Hour-If you have five life or less, double
the power and toughness again.
At the end of your turn, sacrifice half your
creatures (round down)