He has a reasonable 4 Strength and an excellent 9 Willpower, plus he also generates a pretty stunning 4 points of Lore when Questing
According to Wizards of the Coast's official collector's guide, each Secrets of Strixhaven Play Booster contains at least one Mystical Archive card
If you do, you do so as part of the resolution of that ability
Its also an instant that can fire off when your opponents shields are down and can be foretold to save a bit of mana, increase the surprise factor, and net a whole mess of life
Thanks to the limited amount of cards in Pioneer, the heavy-hitting mill cards most would be familiar with are unavailable
General Leo Cristophe* If Leo cost a bit less mana hed be much higher up on this list, as at 5 mana returning one cheap creature, and growing based on how many creatures you have is just not that good especially given he lacks any protection or evasion