Where its at its best is on turn one helping you cast a ton of mana rocks, your Tymna, or a Rhystic Study, or slightly later, maybe on turn three, where it helps you double or triple spell some of your most impactful (but more expensive) cards
This gives you an opportunity to cause double damage, just like in the game
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Unlike other similar huge seven-casting cost flyers (Blizzard Elemental, anyone?), it gave you the mana on the turn you played it to save it
Note this is sacrifice to get past indestructible like the -X/-X'ing we saw earlier with Nuclear Fallout
Untap, upkeep, draw, play, combat, end phase