Dismember Dismember is a wonderful way to remove pesky creatures
There a ton of other cards from the set that are seeing high levels of play, including Necrodominance, Warren Soultrader, Phyrexian Tower, Flare of Denial, Flare of Malice, Toxic Deluge, Fanatic of Rhonas, Consign to Memory, Arena of Glory...honestly, I could keep going, but it's not really necessary
Death Cloud I think I claimed Upheaval was the last in the powerful effects balanced with symmetry but it isn't, this is
Heckbent cares about you having one or fewer cards in your hand (as opposed to hellbent, which requires your hand to be empty)
On the surface, anyone can step onto several sites to make a card, slap it into the form, and voila, you could win the round