What it does
I don't have reliable information about a Magic: The Gathering keyword or ability called "Jast." This doesn't correspond to any official MTG keyword, ability word, or mechanic that I'm aware of.
It's possible this is a typo. You might be thinking of:
- Jump-start — lets you cast an instant or sorcery from your graveyard by paying its cost and discarding a card, then exiling it afterward.
- Cast — the general action of playing a spell.
- A specific card name rather than a keyword.
If you can clarify the correct spelling or provide the card/mechanic you're referencing, I'll give you a precise rundown of what it does, the common rules pitfalls, and how it plays out in Commander. I'd rather not invent rules for a mechanic that doesn't exist.
Iconic cards with Jast
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