This won't freeze cards with automatic skills like towers, Scorpions, RoL, and Chargers. It only freezes cards whose skills must be activated by clicking. Unlike the unupped shard, the upped shard can remain in play indefinitely, but after 3 turns it requires an upkeep, and if there is not enough
quanta for its upkeep it is destroyed.
Edit: Buffed the upped version so that it waits 3 turns before it must pay upkeep.