One powerful example is Gilt-Leaf Archdruid, which draws its controller a card whenever they play a Druid spell
The Ancient One The Ancient One can get a lot of cards in the graveyard by discarding cards like Shadow of Mortality or Draco
What we mean by consistency is that if you are building a deck to be a fighter, you might find that you dont get weapons out often enough or just cant do enough damage
In any particular game state, your deck might want a specific creature on the table to threaten an opponent
By using cards such as Grave Pact, Ashnods Altar, and Butcher of Malakir you should be able to keep most of your opponents from being able to maintain a board state
The trample addition is key here, as simply boosting power and toughness is often not enough for a gang of Wizards to get over the finish line unless they have flying, of course