The Krenko's Buzzcrusher ETB trigger says it destroys "up to one nonbasic land" each player controls.
However, on MTGO it is not currently possible not to choose one of your own lands, even though you should be able to. Basically it works like Sundering Titan and doesn't let you resolve the trigger until you choose your own land.
However, on MTGO it is not currently possible not to choose one of your own lands, even though you should be able to. Basically it works like Sundering Titan and doesn't let you resolve the trigger until you choose your own land.