What it does
I don't have reliable information about a keyword or ability called "Praesidium Protectiva" in Magic: The Gathering. This doesn't match any official keyword, ability word, or mechanic I'm aware of, and it appears to be either fictional, a fan-made creation, or a misremembered name.
If you encountered this on a card or in a game, a few possibilities: it might be flavor text or a card name (Latin-styled names like this are common for Phyrexian or ecclesiastical cards), it could be a custom/unofficial card, or it might be a garbled version of a real mechanic like "Protection," "Hexproof," "Ward," or "Shroud."
If you can share the actual card text or where you saw this, I'm happy to explain the real underlying rules and how they play out in Commander. I'd rather not invent mechanics that don't exist.
Iconic cards with Praesidium Protectiva
See all 1 →