You get a 6/6 for 6 mana, with flying, vigilance, trample, and (often) hexproof
The activated ability is especially useful, letting us cheat on a ton of mana
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Then you can spend four mana over and over again, to Loot a card and have a foe or you mill equal to the discarded card's cost, so that'll fill your graveyard up quickly with discards and mills so you have reanimation fodder
Milling proved to be the obvious answer