You may have Spark Double enter the battlefield as a copy of a creature or planeswalker you control, except it enters with an additional +1/+1 counter on it if it's a creature, it enters with an additional loyalty counter on it if it's a planeswalker, and it isn't legendary.

As long as you control a Jace planeswalker, Jace's Sentinel gets +1/+0 and can't be blocked.

Flying When Mindeye Drake dies, target player mills five cards.

Myriad (Whenever this creature attacks, for each opponent other than defending player, you may create a token that's a copy of this creature that's tapped and attacking that player or a planeswalker they control. Exile the tokens at end of combat.) Whenever Broodbirth Viper deals combat damage to a player, you may draw a card.

Surge {2}{U} (You may cast this spell for its surge cost if you or a teammate has cast another spell this turn.) Target player draws two cards.

{1}{U}, {T}: Draw a card, then discard a card.

Look at the top five cards of your library, then put them back in any order.

When Induced Amnesia enters the battlefield, target player exiles all cards from their hand face down, then draws that many cards. When Induced Amnesia is put into a graveyard from the battlefield, return the exiled cards to their owner's hand.

+2: Each player draws a card. −1: Target player draws a card. −10: Target player mills twenty cards.

{U}, {T}: Each player discards their hand, then draws cards equal to the greatest number of cards a player discarded this way.

Draw three cards.

Draw two cards. If you control a Jace planeswalker, draw three cards instead.

Whenever you draw your second card each turn, put a +1/+1 counter on target creature you control. +1: Draw a card. −7: Creatures you control can't be blocked this turn.

+1: Until your next turn, whenever a creature an opponent controls attacks, it gets -1/-0 until end of turn. −2: Reveal the top three cards of your library. An opponent separates those cards into two piles. Put one pile into your hand and the other on the bottom of your library in any order. −8: For each player, search that player's library for a nonland card and exile it, then that player shuffles. You may cast those cards without paying their mana costs.

+1: Whenever one or more creatures you control deal combat damage to a player this turn, draw a card, then discard a card. −2: Create a 2/2 blue Illusion creature token with "When this creature becomes the target of a spell, sacrifice it." −5: Create two tokens that are copies of Jace, Cunning Castaway, except they're not legendary.

+1: Scry 1, then draw a card. −2: Return target creature to its owner's hand. −8: You get an emblem with "Whenever an opponent casts their first spell each turn, counter that spell."

If you would draw a card while your library has no cards in it, you win the game instead. +1: Target player mills two cards. Draw a card. −8: Draw seven cards. Then if your library has no cards in it, you win the game.

Flying Council's dilemma — When Messenger Jays enters the battlefield, starting with you, each player votes for feather or quill. Put a +1/+1 counter on Messenger Jays for each feather vote and draw a card for each quill vote. For each card drawn this way, discard a card.

At the beginning of your upkeep, target opponent mills three cards, then you draw a card for each land card put into their graveyard this way.

Look at the top three cards of your library. Put one of them into your hand and the rest into your graveyard.

Scry 4, then draw two cards.

Draw three cards. Target player mills three cards.

Enchant creature When Castaway's Despair enters the battlefield, tap enchanted creature. Enchanted creature doesn't untap during its controller's untap step.

Flying Whenever a source deals damage to Belltower Sphinx, that source's controller mills that many cards.

Enchant player At the beginning of enchanted player's upkeep, that player mills two cards.

Target player mills X cards, where X is the number of lands you control.

Whenever you cast a blue spell, target player mills two cards.

Enchant creature Enchanted creature has "{1}{U}, {T}: Target player mills three cards."

Whenever Fleet Swallower attacks, target player mills half their library, rounded up.

Enchant player At the beginning of each end step, enchanted player mills X cards, where X is the number of cards put into their graveyard from anywhere this turn.

Whenever you draw a card, you may have target player mill a card.

Flying When Jace's Mindseeker enters the battlefield, target opponent mills five cards. You may cast an instant or sorcery spell from among them without paying its mana cost.

Flying Jace's Phantasm gets +4/+4 as long as an opponent has ten or more cards in their graveyard.

+1: Draw a card. Target player mills a card. 0: Target player mills ten cards. −7: Any number of target players each draw twenty cards.

{2}, {T}: Target player mills two cards.

Target opponent mills seven cards.

Whenever you draw a card, each opponent mills two cards.

Flying Whenever Shriekgeist deals combat damage to a player, that player mills two cards.

Shriekhorn enters the battlefield with three charge counters on it. {T}, Remove a charge counter from Shriekhorn: Target player mills two cards.

Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.) As long as Stern Mentor is paired with another creature, each of those creatures has "{T}: Target player mills two cards."

Target player mills four cards. You shuffle up to four cards from your graveyard into your library. Replicate {2}{U}{U} (When you cast this spell, copy it for each time you paid its replicate cost. You may choose new targets for the copies.)

Target player mills five cards.

{U}, Sacrifice Vessel of Paramnesia: Target player mills three cards. Draw a card.

Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.) Draw a card.

Flying Whenever Guildpact Informant deals combat damage to a player or planeswalker, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Each player mills four cards. Return up to two instant and/or sorcery cards from your graveyard to your hand. Exile Bond of Insight.

Return target instant or sorcery card from your graveyard to your hand. Exile Flood of Recollection.

Counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard. You may shuffle up to four target cards from your graveyard into your library.

Return up to two target creatures to their owner's hand. You may search your library and/or graveyard for a card named Jace, Arcane Strategist, reveal it, and put it into your hand. If you search your library this way, shuffle.

+1: Look at the top two cards of your library. Put one of them into your graveyard. −3: Return another target nonland permanent to its owner's hand. −8: Each player shuffles their hand and graveyard into their library. You draw seven cards.

Assist (Another player can pay up to {3} of this spell's cost.) Counter target spell.

Until end of turn, each creature target player controls loses all abilities and becomes a blue Frog with base power and toughness 1/1.

Tap target creature. It doesn't untap during its controller's next untap step. Awaken 3—{4}{U} (If you cast this spell for {4}{U}, also put three +1/+1 counters on target land you control and it becomes a 0/0 Elemental creature with haste. It's still a land.)

+1: Draw a card. +1: Untap all creatures you control. −9: Gain control of up to three target creatures.