For 4GG, you reveal the top seven cards of your library and look for any one of twelve relevant keywords (haste being the one Kathril doesnt mention), putting a creature with one of those keywords onto the battlefield and the rest into the graveyard
It saw play for a while when the Shaddoll-Invoked strategy was relevant as a little engine that allowed to gain access to Shaddoll Schism
As he is a dork you can also soft lock people out of the game with cards like Waterfront Bouncer or get other utility from him that you cannot with many other good bounce effects
Take William Huey Jensens 244-card deck from the Top 8 of Grand Prix Milwaukee 2002, designed to exploit Battle of Wits, or Makihito Miharas 64-card Scapeshift deck from the Top 8 of Grand Prix Kobe 2011, where he needed a precise balanceenough Mountains for Scapeshift and enough blue sources for Cryptic Command
Sun Titan Sun Titan, one of the best giants in MTG and among the very best white creatures, is similar to Reveillark in certain combos, but it offers better generic reanimation for white decks
1 It has base toughness 1 until end of turn