Jukai Naturalist saw play, and so can Inquisitive Glimmer
Triggered abilities use the word "when," "whenever," or "at." They're often written as "[Trigger condition], [effect]." Some keywords (such as prowess) are triggered abilities and will use "when," "whenever," or "at" in their reminder text
You can use this to fix your mana colors when you didn't draw it, or destroy nasty lands like Maze of Ith, Volrath's Stronghold, Academy Ruins, Nykthos, Shrine to Nyx and many more and give them a land to keep them happy
5 Day Of Judgment Strictly Better Than: Split Up Day of Judgement isnt a new card, but it certainly is the best at what it does
If youre playing a deck that isnt heavily focused on combat, The Second Doctors How Civil of You ability doesnt even have a downside