Djinn Illuminatus

Mana cost: {5}{U/R}{U/R}
Type: Creature — Djinn
Power / toughness: 3 / 5
Set: Guildpact #142 (rare)
Price: $0.26 USD

({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.)

Djinn Illuminatus has 7 printings, first in Guildpact (2006). EDHREC ranks it #17,957 among Commander cards. It appears most in Ant-Man, Elusive Avenger decks (121 on EDHREC). 1 public deck on TCG runs it. It has 2 official rulings.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: not legal
modern: legal
pioneer: not legal
standard: not legal
brawl: not legal

Public decks that run Djinn Illuminatus

Arcane Maelstrom - Commander 2020, led by Kalamax, the Stormsire

Commanders that run Djinn Illuminatus most

Deck counts from EDHREC.

Often played with Djinn Illuminatus

Cards that show up in the same decks on EDHREC.

Rulings

2006-02-01: If you cast an instant or sorcery spell that has {X} in its mana cost, the value of X in the spell's replicate cost will be the same as the value of X you chose for its mana cost.
2006-02-01: If you cast a spell that already has replicate while you have this creature on the battlefield, the spell will have two replicate abilities: one with a replicate cost as printed on it, and one with a replicate cost equal to its mana cost. (In this set, both costs are always the same.) You may use either ability, or both abilities, to replicate the spell.