You know whats an artifact in the Final Fantasy set
1 reference card
This ensures you can not only keep casting spells, but potentially casting multiple spells per turn
Adventurer's Inn Balamb Garden, SeeD Academy Baron, Airship Kingdom Capital City Clive's Hideaway Cooking Campsite Crossroads Village Eden, Seat of the Sanctum Forest Gohn, Town of Ruin Gongaga, Reactor Town Guadosalam, Farplane Gateway Insomnia, Crown City Ishgard, the Holy See Island Jidoor, Aristocratic Capital Lindblum, Industrial Regency Midgar, City of Mako Mountain Plains Rabanastre, Royal City Sharlayan, Nation of Scholars Starting Town Swamp The Gold Saucer Treno, Dark City Vector, Imperial Capital Wastes Windurst, Federation Center Zanarkand, Ancient Metropolis
Also, since the six-drop beater 6/6 trample Soul of the Harvest is an ETB one, you can get it over and over again with blinks or recursion