Parallectric Feedback

Parallectric Feedback deals damage to target spell's controller equal to that spell's mana value.

Mountain

Djinn Illuminatus

({U/R} can be paid with either {U} or {R}.)
Flying
Each instant and sorcery spell you cast has replicate. The replicate cost is equal to its mana cost. (When you cast it, copy it for each time you paid its replicate cost. You may choose new targets for the copies.)

Island

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Brainstorm

Draw three cards, then put two cards from your hand on top of your library in any order.

Foresee

Essence Scatter

Guard Gomazoa

Defender, flying
Prevent all combat damage that would be dealt to this creature.

Goblin Electromancer

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

Electrolyze

Electrolyze deals 2 damage divided as you choose among one or two targets.
Draw a card.

Invoke the Firemind

Choose one —
• Draw X cards.
• Invoke the Firemind deals X damage to any target.

Negate

Vapor Snag

Return target creature to its owner's hand. Its controller loses 1 life.

Niv-Mizzet, Dracogenius

Flying
Whenever Niv-Mizzet deals damage to a player, you may draw a card.
{U}{R}: Niv-Mizzet deals 1 damage to any target.

Izzet Boilerworks

This land enters tapped.
When this land enters, return a land you control to its owner's hand.
{T}: Add {U}{R}.

Mana Leak

Counter target spell unless its controller pays {3}.

Ionize

Counter target spell. Ionize deals 2 damage to that spell's controller.

Niv-Mizzet, the Firemind

Flying
Whenever you draw a card, Niv-Mizzet deals 1 damage to any target.
{T}: Draw a card.

Isochron Scepter

Imprint — When this artifact enters, you may exile an instant card with mana value 2 or less from your hand.
{2}, {T}: You may copy the exiled card. If you do, you may cast the copy without paying its mana cost.