The Big Green Thing

Vigilance, Trample, Haste, Hexproof, Shroud, Indistructable
This spell can't be countered
{g} Create a tapped copy of The Big Green Thing
This creature can't block creatures with power less than its toughness.
Whenever you cast a spell, pay {g}{g}{g}{g}{g}
or divide your life total in half rounded down.
The Big Green Things power and toughness is equal to 10 times the number of Thing creatures there are on the battlefield.