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summoning monsters: Magi-Nation (9 results!), Huntik (5), Redakai (4)...
mecha/robots: Evangelion (7 hits), what else? (please edit)
It's good to know which ones come up the most, because this way, you can read the new "summoning monsters" anime-ID, cringe at how unsearchable it looks, remember the 4-5 most commonly IDed ones, and go browse their Wikias to see if they involve the one "unique" bit in the new question.