You sacrifice a green creature, search your library for some of the best green green creatures MTG has, and put it straight onto the battlefield
Instead, Celes offers a substantial reward for decks that can consistently play from their graveyard
Obzedat, Ghost Council Image This card has a great enter ability in the sense that it steals life from enemies gives it to yourself and then bounces itself back to your hand during your next upkeep allowing you to do it over and over again until an opponent has counters but there are plenty of counters you could run that would negate the opponent counter, trust me people get quite aggravated when you counter counter
Heroic Intervention doesnt even work, really, because they can target someone elses permanent if they suspect it or even their own
Finally, you can pay five mana to shuffle your library, exile the top card and then play that card for free until the end of your turn
Time to find out which of your permanents is built like a steakhouse but handles like a bistro as you pilot it straight into that weapon of mass disgusting your opponents call their faces