If the creature you control is a legal target but the other creature isnt, your creature will still get +1/+1
Culling Ritual is a board wipe that I have to remember hits all nonland permanents of mana value 2 or less instead of just artifacts, which is what it historically clears due to the best mana rocks all meeting that criteria
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This card just states you must control five ninjas, not five ninja tokens, so this can include other nontoken creatures with the ninja creature type
A lot of mastering Affinity (and any deck in Magic really) is about developing a strong intuition for what to do in each situation, and the only reliable way to do that is by repetition through practice.
Flying.Whenever you cast an Adventure spell or Dragon spell, Lozhan, Dragons Legacy deals damage equal to that spells mana value to any target that isnt a commander