The Ravenous Rotbelly can sacrifice up to three Zombies as soon as it is put into play, for which each opponent has to sacrifice the same number of creatures since there is no actual Boardwhipe in the deck, this can reset the game
The first mode can kill a smaller creature, or pump up a sufficiently large attacker, which you could even use on an opponents creature to ensure both attacker and blocker die in the exchange
Way back in the day, people used to play with a ton of those "artifact" cards -- you remember, Icy Manipulator, Winter Orb, Juggernaut, Mirror Universe -- even the five Mox brothers had a night at the opera
Pumping up your board on ETB is a nice starting point, but there arent many homes for this outside the Growing Threat precon it came in
But, in a slower deck with good protection and ramp, it draws enough cards to overtake most opponents