Kryshnyr of the Dead Sands

Vigilance
Other Zombies you control get +1/+1 for each +1/+1 counter on Kryshnyr of the Dead Sands.
Tap X untapped Deserts you control: Put X +1/+1 counter on Kryshnyr of the Dead Sands.
At the beginning of your end step, sacrifice a desert you control. If you can't, sacrifice Kryshnyr of the Dead Sands.