Its unfortunate that the mana doesnt stick around after combat, but you can sink it into activated abilities or instants
A big creature without evasion isnt so good in a sacrifice deck, the cost to draw cards is steep, and the sacrifice ability has issues both with finding fodder and with killing relevant creatures after turn four
It can upset a lot of players because most of the removal for it can be ripped off the stack
Its not going to suit the more voltron-oriented Enchantress Aura decks, but it can suit the ones that want to go wide (Eriette, the Beguiler
Nintendo Pitch Prototype Wizards of the Coast created this card in 1998 as a presentation piece
Instead, you should turn to this card when you want to just cast one specific, huge payoff cards like Dragonstorm, Ugin, the Spirit Dragon, Soulfire Eruption or Deathbellow War Cry, for example