Finally, pack some win conditions that leverage your tribal strengths , like massive lifedrain effects or sacrifice loops that end the game on the spot
Under the "old" rules, you did not die until the end of the current phase (regardless of your life total), so you could Contract all day long even at zero life and simply cast a game-ending Drain Life to decimate your opponent
Utility: But its not just Rabbits that your creatures can copy
Kiki-Jiki, Mirror Breaker [The Infinite Loop Engine] Kiki-Jiki, Mirror Breaker has been enabling absurd board states for years
The History of Miracle in MTG Miracle was introduced in 2012's Avacyn Restored
The idea of bringing out powerhouse creatures for cheap via dark magic has a timeless appeal, and often translates into a potent strategy to boot