For example, if the exiled card is a land card, you may play it only during your main phase while the stack is empty
Simic has many incredibly powerful commanders like Koma, Cosmos Serpent and Aesi, Tyrant of Gyre Strait that draw the tables aggression early to shut them down
The best cards, however, could easily surpass the value of Hidetsugu, Devouring Chaos (Neon Red), and be worth over $1700
As a simple example, until someone finds a checklist or similar for Ice Age development, I cannot be fully sure that a Sphere of Annihilation version wasn't playtested for Ice Age in 1992, and my collection of pre-Alpha Orbs may well be incomplete without me knowing it
Otherwise Prized Statue or Mycosynth Lattice(if you aren't on a budget) are possibilities.