Enchanted cards are distinguished by their logo as well as being variants of the artwork that are more impressive
If the mana ability of that permanent puts any restrictions or riders on the mana it produces, that will apply to all the mana it produces this way
Blue has it unconditionally, black lets you trade life for it, green often bases it on your creatures, and red has you discard cards in exchange for a draw, but white has almost nothing
Emerald is a disruptive, controlling ink, providing ways to discard your opponents cards, avoid their challenges to quest unopposed, and punish your opponent for challenging your non-evasive creatures
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White creatures often care about equipment, so its worth considering which are worth running