Scapeshift+Exile+ huge Ob Demon

Sacrifice any number of lands. Search your library for up to that many land cards, put them onto the battlefield tapped, then shuffle.

Landfall — Whenever a land you control enters, you may have target player lose 3 life. If you do, put three +1/+1 counters on Ob Nixilis.

Flying Landfall — Whenever a land you control enters, you may exile target nonland permanent other than this creature. When this creature leaves the battlefield, return all cards exiled with it to the battlefield under their owners' control.