Borborygmos and Fblthp (Showcase Planar Booster Fun) [March of the Machine]

Whenever Borborygmos and Fblthp enters the battlefield or attacks, draw a card, then you may discard any number of land cards. When you discard one or more cards this way, Borborygmos and Fblthp deals twice that much damage to target creature.

{1}{U}: Put Borborygmos and Fblthp into its owner's library third from the top.