Sure, playing a 5-mana enchantment that basically says, you win the game sounds super powerful, but since youll be putting over 200 cards in your deck, the odds of you drawing it will be pretty low
Thats a very low cost for an extra land - and means that if you cast it on your second turn, youll have four mana on your third turn
As such, it's easy to find a way to return Thousand-Faced Shadow to hand so that it can copy another attacking creature later on
Nevertheless, the total number of cards that you see in a draft is much higher than in Sealed Deck
This is a downside if you're removing +1/+1 counters or similar, but removing a lore counter from a saga is all upside, keeping it in play for another turn and rebuying your earlier saga abilities
What about a wildly exploitable artifact that all but guarantees you infinite turns with very little work