The Theorist, Jace Beleren

It replaces itself on the next opposing draw step and snowballs thereafter; it projects below Ral, Crackling Wit (82) but as a strong control finisher.

Could be wrong if Fast boards or efficient planeswalker removal may make its three starting loyalty too unreliable for regular maindeck use.

Recurring cards make Jace more appealing than many four-mana walkers, but its low loyalty and delayed board impact keep it near Kaito, Bane of Nightmares (58).

Could be wrong if Pioneer's proactive decks and efficient disruption may leave too little room for a tapped-out four-mana value engine.

A protected Jace generates real advantage, but four mana and three loyalty are major liabilities; it is a narrower prospect than Teferi, Hero of Dominaria (55).

Could be wrong if Modern's speed and efficient answers may make even a one-card-per-turn engine too slow to retain a slot.

UWx Control can protect a persistent draw engine, but Jace lacks immediate impact and compares unfavorably with the more established Kaito, Bane of Nightmares (58).

Could be wrong if Four mana is a steep investment in Legacy, and the walker may be removed before its repeated draw trigger matters.

Drawing on every opponent's draw step can produce three cards per rotation, making it a major engine if protected, though far more fragile than Rhystic Study (90).

Could be wrong if An opponent can remove Jace after the first trigger, and three loyalty makes defending it against multiple players difficult.

A repeatable card-draw engine that also makes blockers or bounces threats will dominate most games where it survives, with a game-ending ultimate as backup.

Could be wrong if Unknown removal density and format speed could make a four-mana, three-loyalty planeswalker substantially easier to punish.