Thought Vessel

You have no maximum hand size.
{T}: Add {C}.

Sol Ring

Dissipation Field

Whenever a permanent deals damage to you, return it to its owner's hand.

Meishin, the Mind Cage

All creatures get -X/-0, where X is the number of cards in your hand.

Kami of the Crescent Moon

At the beginning of each player's draw step, that player draws an additional card.

Arcane Melee

Instant and sorcery spells cost {2} less to cast.

Possessed Portal

If a player would draw a card, that player skips that draw instead.
At the beginning of each end step, each player sacrifices a permanent of their choice unless they discard a card.

Sapphire Medallion

Blue spells you cast cost {1} less to cast.

Gilded Lotus

Mikokoro, Center of the Sea

{T}: Add {C}.
{2}, {T}: Each player draws a card.

Long-Term Plans

Search your library for a card, then shuffle and put that card third from the top.

Wizards of Thay

Myriad (Whenever this creature attacks, for each opponent other than defending player, you may create a token copy that's tapped and attacking that player or a planeswalker they control. Exile the tokens at end of combat.)
Instant and sorcery spells you cast cost {1} less to cast.
You may cast sorcery spells as though they had flash.

Thought Reflection

If you would draw a card, draw two cards instead.

Reliquary Tower

Howling Mine

At the beginning of each player's draw step, if Howling Mine is untapped, that player draws an additional card.

Omniscience

You may cast spells from your hand without paying their mana costs.

Mind Unbound

At the beginning of your upkeep, put a lore counter on Mind Unbound, then draw a card for each lore counter on Mind Unbound.

Flow of Ideas

Fellwar Stone

{T}: Add one mana of any color that a land an opponent controls could produce.

Font of Mythos

At the beginning of each player's draw step, that player draws two additional cards.

Consecrated Sphinx

Flying
Whenever an opponent draws a card, you may draw two cards.

Propaganda

Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you.

Plagiarize

Until end of turn, if target player would draw a card, instead that player skips that draw and you draw a card.

Zur's Weirding

Players play with their hands revealed.
If a player would draw a card, they reveal it instead. Then any other player may pay 2 life. If a player does, put that card into its owner's graveyard. Otherwise, that player draws a card.

Telepathy

Your opponents play with their hands revealed.

Triskaidekaphile

You have no maximum hand size.
At the beginning of your upkeep, if you have exactly thirteen cards in your hand, you win the game.
{3}{U}: Draw a card.

Teferi's Ageless Insight

If you would draw a card except the first one you draw in each of your draw steps, draw two cards instead.

Dictate of Kruphix

Flash (You may cast this spell any time you could cast an instant.)
At the beginning of each player's draw step, that player draws an additional card.

Enter the Infinite

Draw cards equal to the number of cards in your library, then put a card from your hand on top of your library. You have no maximum hand size until your next turn.

Tomorrow, Azami's Familiar

If you would draw a card, look at the top three cards of your library instead. Put one of those cards into your hand and the rest on the bottom of your library in any order.

Teferi's Puzzle Box

At the beginning of each player's draw step, that player puts the cards in their hand on the bottom of their library in any order, then draws that many cards.

Sky Diamond

Mindsplice Apparatus

Flash
At the beginning of your upkeep, put an oil counter on Mindsplice Apparatus.
Instant and sorcery spells you cast cost {1} less to cast for each oil counter on Mindsplice Apparatus.