Heck, thats what the name Unlimited was originally supposed to meanthe black-bordered set would have a limited print run, while the white-bordered set would have an unlimited print run
Tergrid, God of Fright is a very salt-inducing card, however
This doesnt affect the spells mana value, just the amount of mana you pay
Beastmaster Ascension: This is one of the best go-wide finishing cards, and included here as a way to make your creatures all super pumped, so only 3 Squirrels can kill Emrakul, rather than 15
You'll need to find a way to untap it to activate both abilities during one turn
This set is a tribute to the 2006-7 Time Spiral block, including not only fan-favorite cards and mechanics from that set, but also a collection of timeshifted, classic Magic cards to add some variety