Reach
You have no maximum hand size.
The first time you would draw a card each turn except the first card you draw during each of your draw steps, you draw four cards instead.

Whenever this creature deals damage to an opponent, that player mills a card.

: Target land becomes the basic land type of your choice until end of turn.

When this creature dies, create a 3/3 blue Fish creature token with "When this token dies, create a 6/6 blue Whale creature token with 'When this token dies, create a 9/9 blue Kraken creature token.'"

Exile target nonland card in a graveyard that was put there from anywhere this turn. Copy it. You may cast the copy without paying its mana cost.

Convoke
Vigilance
When this creature enters, tap target creature an opponent controls and put a stun counter on it.

As this enchantment enters, choose a creature type.
Whenever you cast a spell of the chosen type, copy that spell. (A copy of a permanent spell becomes a token.)

When this creature enters, you get a one-time boon with "When you cast an instant or sorcery spell with mana value 3 or less, copy it. You may choose new targets for the copy."

Untap target creature.
Draw a card.

Counter target spell. Draw a card, then discard a card.

Return target permanent to its owner's hand.

Untap all creatures you control and all creatures target opponent controls. You and that opponent each gain control of all creatures the other controls until end of turn. Those creatures gain haste until end of turn.

Counter target creature or planeswalker spell unless its controller pays . If that spell is countered this way, exile it instead of putting it into its owner's graveyard.

Counter target spell. If that spell's mana value was 3 or less, proliferate.

Return target instant or sorcery card from your graveyard to your hand.

Exile target nonland permanent. For as long as that card remains exiled, its owner may cast it without paying its mana cost.

Amass Zombies 3.

As an additional cost to cast this spell, exile a creature card from your graveyard.
Undying

Enchant artifact an opponent controls
Whenever enchanted artifact becomes tapped, choose one —
• This Aura deals 1 damage to target player or planeswalker.
• Target player gains 1 life.

This creature can't be blocked if you've cast a historic spell this turn. (Artifacts, legendaries, and Sagas are historic.)

Until end of turn, target artifact or creature becomes a Dinosaur artifact creature with base power and toughness 4/3 in addition to its other types.

Create a token that's a copy of target artifact, creature, or land.

Counter target spell. If that spell is countered this way, put it into its owner's hand instead of into that player's graveyard.
Draw a card.

Target player shuffles their graveyard into their library.

If you would empower Jace, you may instead put that many loyalty counters on a Jace you control.
: Empower Jace 1.
, : Draft a card from the Beleren Spellbook.

Remnants of Beleren's spellbook includes the following cards:
• Jace, Arcane Strategist
• Jace, Architect of Thought
• Jace Beleren
• Jace, Ingenious Mind-Mage
• Jace, Memory Adept
• Jace, Mirror Mage
• Jace Reawakened
• Jace, the Living Guildpact
• Jace, the Mind Sculptor
• Jace, the Perfected Mind
• Jace, Unraveler of Secrets
• Jace, Vryn's Prodigy
• Jace, Wielder of Mysteries
• Jace, Reality Sculptor
• The Theorist, Jace Beleren

Cast this spell only during the declare attackers step and only if you've been attacked this step.
Return target attacking creature to its owner's hand.

Counter target creature spell.

You may cast Dragon spells and artifact spells as though they had flash.
Choose a Background (You can have a Background as a second commander.)

Whenever another creature you control enters, you may have this creature become a copy of that creature until end of turn. (If it does, it loses this ability for the rest of the turn.)