Cast Triumph of the Hordes by paying ({2} magic symbol) ({G} magic symbol) ({G} magic symbol) , giving all creature you control +1/+1, trample, and infect untile end of turn.
Activate Borborygmos by discarding a land, dealing three infect damage to an opponent.
Curiosity triggers, causing you to reveal cards from the top of your library until you reveal a land card, put it into your hand and put all other cards revealed this way on the bottom of your library.