It so happens that they are abilities that you can activate from your hand, and that's why they feel like you're casting a spell but you arent, so alternative costs have nothing to do here
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That creature gains bushido 1 and becomes a Samurai in addition to its other creature types
Mirror Room / Fractured Realm copies a creature or doubles the triggers of all your stuff, including your commander
The biggest issue with other cards that provide additional draw effects for your opponents is that the player to your left, the player whose turn other additional draw effects would help first, has access to the extra cards first, giving them an advantage over your other opponents
This reminds me of Guttersnipe