It makes each opponent lose life at the start of your upkeep step, and then you get a 1/3 Plaguebearer token for each player that has less life than you
You see, you only lose the life if you actually draw the card and don't replace it
Once the card is defeated, you can then flip it, and cast the backside, revealing your reward
So, casting a creature for its blitz cost gets you a hasty creature that draws you a card when it dies, and will die at the next end step
Of course you dont necessarily need to take on the challenge of assembling your own custom Cube
Land Color tag templates(None) Color tag templates(None) Forest Basic Land - Forest Color tag templates(None) Forest Basic Land - Forest Color tag templates(None) Hinterland Harbor This land enters tapped unless you control a Forest or an Island