Whenever a permanent an opponent controls is put into a graveyard, put that card onto the battlefield under your control unless that opponent pays 3 life. Suddenly every lost permanent is a potential ally for you, and if not, your opponents have to lose life just to stop you from stealing their stuff
For example, Dark Magician Girl gains an additional 300 ATK for every Dark Magician and Magician of Black Chaos in either players graveyard
Omnath, you will be remembered, for better or for worse
It never featured in any starter decks for Rise of the Floodborn or later sets, however, so acquiring copies of the card was still a luck of the draw situation
3 mana and 3 life for 3 cards is just a great rate, and the caveat of requiring 3 colors of mana was easy to fulfill between Battle lands and fetchlands
War Room allows to draw some cards by losing life, and its something that you can be interested in