You may cast target instant or sorcery card from an opponent's graveyard without paying its mana cost. If that spell would be put into their graveyard, exile it instead.
Cipher

Look at the top four cards of your library. You may reveal an instant or sorcery card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.
Flashback

Search the Room — : Roll a d20.
1-9 | Draw a card.
10-20 | Look at the top three cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order.

Each player can't cast more than one spell each turn.

: Add .
, : Until end of turn, creatures your opponents control lose hexproof and shroud and can't have hexproof or shroud.

Instant and sorcery spells cost less to cast.

Converge — Target player discards X cards, where X is the number of colors of mana spent to cast this spell.

Prototype — 2/1
When this creature enters, if you cast it, exile target instant or sorcery card with mana value less than or equal to this creature's power from your graveyard. Copy that card. You may cast the copy without paying its mana cost.

This land enters tapped.
: Add , , or .

Before you shuffle your deck to start the game, you may reveal this card from your deck and exile an instant or sorcery card you drafted that isn't in your deck.
When this creature enters, copy a card you exiled with cards named Arcane Savant. You may cast the copy without paying its mana cost.

: Add one mana of any color in your commander's color identity.

, , Sacrifice a land: Draw a card and put a charge counter on this artifact.
Remove three charge counters from this artifact: Draw a card.

Target creature gets -4/-0 until end of turn.
Learn.

Enchant creature
Enchanted creature gets +2/+2 and has ": This creature deals 1 damage to any target."

: Draw three cards.
: Return Arcanis to its owner's hand.

Flying
When this creature enters, look at the top four cards of your library. You may reveal an artifact or enchantment card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.

Equipped creature has flying.
Equip
Equipment swap (: Exchange this Equipment with an Equipment card in your hand. If this Equipment was attached to a creature, attach the new Equipment to that creature.)

Enchant creature
Enchanted creature has flying.
Aura swap

Choose target creature. Whenever that creature is dealt damage this turn, it deals that much damage to each other creature and each player.

Flying
Modular 3
Whenever another artifact you control enters, target creature an opponent controls gets -1/-1 until end of turn.

Trample
Whenever another artifact enters, put a +1/+1 counter on this creature.
Modular 1

Fear
At the beginning of your upkeep, you may move a +1/+1 counter from target creature onto this creature.
Modular 3

Haste
Modular 2

, Remove X +1/+1 counters from this creature: It deals X damage to target attacking or blocking creature.
Modular 1

First strike
Modular 4

Lifelink
Modular 1

At the beginning of your upkeep, put a +1/+1 counter on each creature you control with modular.
Modular 6