If you come up against a lot of Aggro, you may want to swap out a Polymorph for a Volcanic Potion.
After playing a standard version of the infinite fireball combo, I started to get pretty annoyed with having to run two copies of Molten Reflection. So here’s my take on a wild version where they are both replaced by a single Echo of Medivh. You still need the same number of cards to perform the combo, but one can be any spell of cost 5 or lower.
To perform the combo, you need: 2xSorcerer's Apprentice, 1xEcho of Medivh, 1xArchmage Antonidas, 1xSpell of cost 5 or less, and of course, 1xTime Warp from your quest.
You play both Apprentices (4 mana), Echo them (2 mana), Play a third Apprentice (2 mana) and Time Warp (2 mana, for a total of 10 mana used this turn). On the extra turn, you play Antonidas (7 mana), the fourth Apprentice (2 mana) and any spell of cost five or lower (0-1 mana, for 10 mana total this turn).
You will then have infinite fireballs to kill all the dinosaurs. Unless the dinosaurs have Ice Block.