It is a card that is said to be the pinnacle of the Power Nine for its outstanding performance
You can technically brute force your way around type advantage for some battles, but once you get to the end-game trainers or fight online, you will need to know this chart type like the back of your hand

$69.99 Bolas's Citadel (0007 - Kefka's Tower) Final Fantasy Through the Ages $0.79 Wall of Omens (0027 - The Imperial City of Archades) Final Fantasy Through the Ages $0.79 The Ultimate Nightmare of Wizards of the Coast Customer Service Unglued $89.99 Yuna, Grand Summoner (0208 - Borderless) Final Fantasy Commander Decks Variants $8.99 Vincent Valentine (0383 - Borderless) Final Fantasy Variants $10.99 Bruse Tarl, Boorish Herder (0050 - Hugo Kupka) Final Fantasy Through the Ages $17.99 Firion, Wild Rose Warrior (0531 - Borderless Surge Foil) Final Fantasy Variants $32.99 Sram, Senior Edificer (0003 - Firion, Swordmaster) Final Fantasy Through the Ages $54.99 Dark Ritual (0008 - Darkness of Eternity) Final Fantasy Through the Ages $299.99 Atraxa, Grand Unifier (0049 - Sephiroth, the Savior) Final Fantasy Through the Ages $199.99 Sephiroth, Fabled SOLDIER (0317 - Borderless) Final Fantasy Variants $199.99 Yuna, Hope of Spira (0549 - Borderless Surge Foil) Final Fantasy Variants 0 results found

Both Esper and Grixis explore the card drawing design space, and drawing from a Saga and having all of your mana ready to go with your full grip is an advantage some players don't fully realize the benefit of until it happens to them (I'm telling on myself)