When it enters, you get a 2/2 Robot for each multicolored permanent you control, and once it's stationed up to 12 counters, it becomes a 7/15 flier that draws cards every time it attacks
Permanents that arent on the battlefield are either permanent cards or permanent spells. Banishing Light cant target cards in graveyards because theyre permanent cards, not permanents on the battlefield
Id also be curious to see what the combination would be for your moms deck, if you want to find us on Twitter to let me know
They usually cost a ton of mana to get onto the battlefield, but if you've built around them correctly you can get them out and you can get up to all kinds of fun with them
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Safeguard Just invest 3 mana to prevent the combat damage a creature will do