With just one target he is very hit and miss and even at two he will still miss finding something often enough to be annoying
In Legends, Agile attacks are somewhat weak
While incredibly luck-based, the immediate removal can disrupt many strategies (especially those that need to spend turns building Energy), and if you're lucky enough you can hit the Instant-Win Condition by leaving your opponent with no Pokmon on the field by shuffling them all back and them failing to find any additional Basic Pokmon
Pack a Retribution of the Ancients, Together Forever, or Blade of the Bloodchief to turn it up to eleven
Like most Magic: The Gathering cards, the value of Sundial of the Infinite depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (The List)
The last straw