In a strange twist, Shilgengar, Sire of Famine can use an angel to eventually bring back a massive amount of creatures
You rarely see extra turn spells cost less than five mana in modern Magic, and for good reason
Casual players have more flexibility, though the language barrier can make Japanese cards challenging without translation references
While you can use it as ramp in an artifact creature heavy deck, it can turn into a hidden win condition with the right cards
A card with 2,000 PSA 10s in early 2022 might have 8,000 PSA 10s now, and the price has adjusted accordingly
In fact, a flashback spell like Increasing Ambition might be better if you skip casting it the first time and just discard it and flash it back for the greater effect