And, if thats not enough, there are many more combos you can pull off with lots of access to proliferate
If one of those creatures can't attack its owner that turn due to a spell or ability (such as Chronomantic Escape), you may have it attack another player, attack a planeswalker an opponent controls, attack a battle an opponent protects, or not attack at all
But since many discard costs have little or no associated mana cost, a deck that pays for things via discard gets to cut out half of those steps
It also produces a creature token when it enters which is (once again) great for decks that want fodder to sacrifice
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If you are going to hit your fourth land on time for some big whammy like Hellrider or Hazoret, you are going to want 23 or 24 lands