From that point on, it taps for 1 blue mana per artifact you control, which can turn a board full of tokens into a tidal wave of mana
Legendary Collection has a Reverse Holofoil parallel tracked separately from the regular normal printing for Abra
It doesn't copy whether that permanent is tapped or untapped, whether it has any counters on it or any Auras and Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, or so on
I remember hearing about a deck that Charlie Catino (our current Director of New Business in R&D) played where he kept using Timetwisters to keep shuffling graveyards back into libraries
Red has some good puzzle pieces looking for the right home
Its a flexible tool in tempo or aggro builds that want to squeeze extra value out of combat