You may cast colorless spells and artifact spells as though they had flash.
Whenever you cast a spell, if the amount of mana spent to cast that spell is greater than Liberator's power, put a +1/+1 counter on Liberator.
Build a colorless artifact deck that abuses Liberator's flash-granting ability to play the entire game on instant speed, casting big colorless spells (Eldrazi, Karn, mana rocks) during opponents' turns to dodge sorcery-speed interaction and tax. Liberator grows with every expensive spell you cast, eventually becoming a flying beater while you out-tempo the table with reactive haymakers.
Flash on all colorless and artifact spells creates massive instant-speed flexibility and ambush blocks
Colorless identity lets you run the most powerful generically-useful artifacts and Eldrazi
Self-growing flier doubles as a real clock and survives some board wipes via flash recasts
Cheap to recast at three mana, with Flash for its own evasive surprise blocks
Colorless means no access to colored removal, tutors, card draw, or sweepers—interaction is thin
Easily removed and must be recast, and the deck leans on it to function smoothly
Ramp-dependent: bricks badly if mana rocks are destroyed or you miss early rocks
Struggles against fast combo it can't interact with through colored counterspells
Legendary Artifact Creature — Thopter