What makes Standard so accessible and broad is that it pulls on the latest Magic: The Gathering expansions for its pool of legal cards, which the Final Fantasy set will join when it releases June 13
For these we have: Neheb, the Eternal, to ramp mana from our attacks
Ruby/Amber is often considered a rogue deck, be it in its Mufasa version or the Locations and Racers deck
That'd be great on its own, but Ancient Cellarspawn also causes an opponent to lose life equal to the difference between the mana you spent and the mana you should have spent without all the discounts
Legendary Creature - Assassin Burn (CTRL to add secondary) Counters Rosa, Resolute White Mage Reach (This creature can block creatures with flying.) At the beginning of combat on your turn, put a +1/+1 counter on target creature you control
A target is "without a hat" if they don't meet the criteria for "having a hat." (You probably don't need to look that up