Prototype {1}{U}{U} -- 2/1 (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.)

When Arcane Proxy enters the battlefield, if you cast it, exile target instant or sorcery card with mana value less than or equal to Arcane Proxy's power from your graveyard. Copy that card. You may cast the copy without paying its mana cost.

Instant and sorcery spells you cast cost {1} less to cast.

Whenever a spell or ability you control counters a spell, you may draw a card. If you do, discard a card.

As Cloud Key enters the battlefield, choose artifact, creature, enchantment, instant, or sorcery.

Spells you cast of the chosen type cost {1} less to cast.

Instant and sorcery spells you cast cost {1} less to cast for each time you've cast a commander from the command zone this game.

Instant and sorcery spells you cast cost {1} less to cast.

Flying

Haughty Djinn's power is equal to the number of instant and sorcery cards in your graveyard.

Instant and sorcery spells you cast cost {1} less to cast.

Instant and sorcery spells you cast cost {1} less to cast.

Whenever you cast an instant or sorcery spell, scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)

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

Spirit creatures you control get +1/+1.

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.

Whenever you cast an instant or sorcery spell with mana value greater than the number of experience counters you have, you get an experience counter.

Instant and sorcery spells you cast cost {1} less to cast for each experience counter you have.

Flying

Instant and sorcery spells you cast cost {1} less to cast.

Whenever you cast an instant or sorcery spell, you may pay {U}{R}. If you do, copy that spell. You may choose new targets for the copy.

Whenever another nontoken creature enters the battlefield under your control, you may pay {G}{U}. If you do, create a token that's a copy of that creature.

Flying

When Spectral Arcanist enters the battlefield, you may cast an instant or sorcery spell with mana value less than or equal to the number of Spirits you control from a graveyard without paying its mana cost. If that spell would be put into a graveyard, exile it instead.

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.)

Instant and sorcery spells you cast cost {1} less to cast.

You may cast sorcery spells as though they had flash.