Once you know what style you like, choosing a color will become easier
Gwenom, Remorseless Bolas's Citadel is a messed up card
(2024-09-20) If a face-down creature loses its abilities, it can't be turned face up with a disguise or morph ability because it will no longer have that ability (or the associated cost) once face up
So you can play recklessly and have characters banished left and right in order to play this card for next to nothing
There arent specific scenarios where A Whole New World is a must-have
Uncommons Armored Scrapgorger Evolving Adaptive Tyvar's Stand Drown in Ichor Sheoldred's Edict Rares Bloated Contaminator Venerated Rotpriest Skrelv's Hive Copperline Gorge Skrelv, Defector Mite Mythic Rares Vraska, Betrayal's Sting Mondrak, Glory Dominus Phyrexian Obliterator Nissa, Ascended Animist Tyrranax Rex Phyrexia: All Will Be One Is Here Now that you have some (preliminary) tools to match your talent, your next step might be to jump into the Standard Metagame Challenge, February 1013, and test yourself while claiming rewards for your well-planned strategies