Jace, Multiverse Architect - Intelligence

Jace turns expendable tokens into the best creature or planeswalker still hiding in your library. His +1 repairs your hand and puts accidentally drawn bombs back into the deck, while his −3 converts disposable permanents into game-changing threats.

Jace enters with 4 loyalty. A freshly resolved Jace may activate −3 immediately (loyalty abilities only require paying the cost once per turn per planeswalker, and this is his first activation that turn), leaving him at 1 loyalty.

The +1 ability draws two cards, then mandates putting a card from hand onto the bottom of the library whenever a card is available to bottom. This is bottoming, not discarding, and the bottomed card need not be a card just drawn.

The word "another" in −3's target line prevents Jace from targeting himself. Legal targets are limited to another creature you control or another planeswalker you control -- including creature tokens, nontoken creatures, planeswalker tokens, and other planeswalkers.

If the sole target of −3 becomes illegal before the ability resolves, the ability is removed from the stack without resolving: no exile, no reveal, no battlefield entry. Loyalty already paid as the activation cost is not refunded.

A token target exiled by −3 ceases to exist under normal token state-based-action rules once it leaves the battlefield. That disappearance does not interrupt or cancel the rest of an already-resolving −3 ability -- the reveal and battlefield-entry steps still happen.

A nontoken permanent exiled by −3 stays exiled unless a separate effect returns it. This is not a sacrifice, blink, tuck, shuffle, or graveyard-recursion effect, and using a nontoken permanent as fodder is a genuine card-advantage cost, not a free action.

−3 reveals until a creature OR planeswalker card, which is a broader hit pool than a standard creature-only Polymorph effect. Both eligible-hit types can dilute or improve pool quality depending on what's left in the library.

The revealed hit is put onto the battlefield directly. It is not cast, so cast-triggered abilities, cascade, storm, and "whenever you cast a spell" effects do not trigger from this deployment. ETB triggers, static abilities, and replacement effects on the permanent itself apply normally, and a planeswalker hit enters with its normal starting loyalty.

If no creature or planeswalker card remains anywhere in the library when −3 resolves, the entire remaining library is revealed, no permanent enters the battlefield, and every revealed card goes to the bottom in a random order. No permanent is invented to fill the miss.

If exactly one eligible creature-or-planeswalker card remains in the library, any legal −3 activation guarantees that exact hit. This is a deterministic single-hit Polymorph line, not an infinite combo -- it still costs loyalty, a permanent target, and one activation per hit.

Proteus Staff (puts target creature on the bottom of its owner's library, then that creature's controller reveals until a creature card and puts it onto the battlefield) and Jace's −3 (exiles the target, reveals until a creature-or-planeswalker hit, bottoms the rest) both cheat a permanent into play, but differ in cost, target scope, bottom-vs-exile handling of the target, and creature-only vs. creature-or-planeswalker hit pool. Mass Polymorph and Synthetic Destiny affect multiple creatures at once; Transmogrify and Reweave are single-target creature-for-creature swaps. None of these are duplicates of Jace's own ability, and none of this file's relationships assume they are.

Reduce the library to one eligible creature-or-planeswalker card, then activate −3 on any legal token or permanent to guarantee that hit.

Run several premium creature/planeswalker hits behind heavy noncreature token generation, accepting hit-pool variance for resilience.

Maximize noncreature/permanent-token generation so Jace never has to spend a nontoken card as −3 fodder.