Geosurge

Add {R}{R}{R}{R}{R}{R}{R}. Spend this mana only to cast artifact or creature spells.

Pact of the Titan

Create a 4/4 red Giant creature token.
At the beginning of your next upkeep, pay {4}{R}. If you don't, you lose the game.

Mountain

Lotus Petal

{T}, Sacrifice Lotus Petal: Add one mana of any color.

Mass Hysteria

Seething Song

Simian Spirit Guide

Exile Simian Spirit Guide from your hand: Add {R}.

Elvish Spirit Guide

Exile Elvish Spirit Guide from your hand: Add {G}.

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.)