Youre restricted to power 2 or less, but even then, we can be creative
Adopting similar text as seen on Platinum Angel, Herald of Eternal Dawn boasts that you cannot lose the game where your opponents cannot also win the game, giving you a lifeline if you need another turn (or so) to win
Urzas Incubator If you land an Ugin's Labyrinth correctly, you could drop an Oblivion Sower on turn 3 with Urza's Incubator on turn 2
Looking at the most valuable cards in the Final Fantasy x Magic: The Gathering set as of the time of writing shows that the highest-value cards are all either foil or surge foil printings, which seems to have contributed to the hyper-inflated cost of both individual Collector Booster packs (now going for $100 on the secondary market) and a Collector Booster Display Box (fetching up to $1,200)
I wouldnt be happy with this unless it were making four or more mana every turn, since the initial 4-mana 2/4 isnt the best thing to have on the battlefield
However, some cards with fear still see play today