Make the Instant/Sorcery Lord. Rare or Mythic. It can be a creature, an enchantment, or a spell with Engrave that gives special powers to the Golem token.

Chronicler Sphinx

Creature - Sphinx (M)
4/4

Flying
At the beginning of your end step, you may exile any number of instant or sorcery cards from your graveyard. For each card exiled this way, put a 2/2 colorless Golem artifact creature token onto the battlefield. When that creature dies, you may cast the exiled card without paying its mana cost.

Cross her and be crushed beneath the weight of history.

Librarian of the Arcane -
Creature - Sphinx
Flying
Spells and abilities your opponents control can't cause you to discard cards.
When ~ enters the battlefield or at the beginning of your upkeep, you may discard your hand. If you do, search your library for an instant or sorcery card for each card discarded this way, reveal them and put them into your hand. Then, shuffle your library.
4/5

Cavconilla, The Far-Caster
Legendary Creature - Vedalken Wizard
Whenever you cast an instant or sorcery spell, if that spell targets a single creature, copy the spell for each other creature controlled by that creature's controller. Each copy targets a different one of those creatures.
4/3

Supreme Arcanist

Creature - Human Wizard
Whenever you cast an instant or sorcery spell from your hand, you may exile it. If you do, copy each instant card and sorcery card you own in exile and you may cast the copies without paying their mana costs. Otherwise, draw a card.
"Magic need not be spent or used up -- it can feed itself onward to infinity, growing faster as it grows. Understand this, and you shall know the tiniest portion of my power."
3/3

Make a soft counterspell at common. (That means a conditional counterspell like Negate or Remand.)

Reprint Steel Sabotage.

Gale of Denial -
Instant
Counter target spell unless its controller taps an untapped creature he or she controls.

Spell Freeze

Instant [C]
Counter target spell if it was cast when it's controller couldn't cast a sorcery.

Isolate
Instant (C)
Counter target spell unless its controller reveals a land card from his or her hand.