Ideally, you want to fill your deck with cards that take advantage of this, cards like Zendikars Roil and Scute Swarm, and then just make sure you can keep drawing and playing land cards until you eventually overrun the board with obnoxiously strong beasts that can trample through your enemies
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Of course, the only real way to deal with Progenitus is with a board wipe of some kind, but, even then, if it goes into the graveyard you just shuffle it back into your deck
You draw a card and gain 2 life
The final ability on the card, which allows its controller to pay three mana and sacrifice another creature to draw cards equal to the sacrificed creatures toughness, then discard cards equal to its power, will pair perfectly with not only walls, but certain treefolk, turtles, and plants, too creature types that will almost certainly fill out an eventual Felothar deck