Today I want to rank all ten of them, from the least problematic to the most, and I'd love for you to share your own thoughts with me in the comments below when we're all done
If you had a card for a single white mana that said "You gain 100 life," that would be worthy of main deck consideration
Similarly, each time a Horror creature, Nightmare creature, enchantment creature, or face-down creature you control attacks an opponent, that opponent become afraid of you for the rest of the turn, regardless of what happens to the creature that attacked
What they do share, however, is a replacement effect that cares about token creation
However, she can also make your next spell one generic mana cheaper for each Artifact you control, which is huge given that a lot of the best Artifacts only cost generic mana anyway
That gives you four hits of free mana before you have to cut yourself off