step 15: cast Ichor Rats to give each player a poison counter, then use either contagion clasp to give players more poison (up to their pre subgame amount), or Suncleanser to remove poison from those who didn't have any
The earliest mechanic was dubbed Day/Night
Now you'll sacrifice 2 lands or so, and you'll get all of those sacrificed by others, in a four-player game you are up by 4-6 lands
This is good in creature aggro as well as decks built around draining life
There's no learning curve, no tutorials to sit through, and no design files to manage
These abilities can only be used at Sorcery speed, but because the active player gets priority after a card enters the battlefield - you're pretty much guaranteed to be able to use of them before anyone can stop you