Having many, many ways to recur the only four extra turn spells available means that the deck has more effective copies of those cards, as a card like RegrowthRegrowth is just a Final FortuneFinal Fortune for two more mana with the latter in the graveyard
High Utility, Low Price Solemn Simulacrum Myr Battlesphere Parting Thoughts Ancient Excavation Grave Upheaval Open the Vaults Phyrexian Rebirth Everflowing Chalice Fellwar Stone Ichor Wellspring Mycosynth Wellspring Swiftfoot Boots Commanders Sphere Loxodon Warhammer Nevinyrrals Disk Trading Post Theres something interesting about the dip in viable collector builders with this and Breed Lethality
Creatures (20) Lands (23) Spells (17) Sideboard As a two-drop that rewards you for playing cheap cards, it has frequently been used as part of a beatdown plan, giving you more fuel to keep snowballing advantage
Chasm Skulker does have some nice synergy with [[Tidus, Yuna's Guardian]], as you automatically get counters on it to proliferate
Teferi, Mage of Zhalfir Teferi, Mage of Zhalfir has to be one of the most annoying commanders to play against
Final Fantasy is rich, wide, and its predilection for throwing everything out and starting over for each numbered entry means that it is far too deep to be summarized in just a few hundred cards