Kerker, der Dünenschlucker

Trample,
Kerker has hexproof if you controll a desert
or there is a desert card in your graveyard.
ETB, choose an opponent secretly.Reveal the
player you chose,if he/she attacks you or targets
you or a permanent you control with a spell:
Destroy all lands that player controll and create X
0/1 colorless Wormegg tokens, where X is the
number of lands destroyed that way. If Kerker
would be put into a graveyard exile it.