Ruby/Amethyst and Emerald/Steel are both great color combos, so these may well be easy to upgrade
They are not often heralded as power spells but they are good tempo and disruption tools and the best blue has got in terms of removing permanents
If you can play The Emperor of Palamecia on turn 2, then you get to cast your first 4-drop spell on turn 3 and start the engine right away, which is bound to be awesome
When youre trying to flip Kuja, playing Wizards like Harmonic Prodigy and Mysidian Elder will get you there much faster
Triggered abilities use the word "when," "whenever," or "at." They're often written as "[Trigger condition], [effect]." Some keyword abilities are triggered abilities and will have "when," "whenever," or "at" in their reminder text
With one or two in the deck, we can see this getting play