Brain in a Jar

two generic mana Artifact

one generic mana , tap this permanent : Put a charge counter on this artifact, then you may cast an instant or sorcery spell with mana value equal to the number of charge counters on this artifact from your hand without paying its mana cost.

three generic mana , tap this permanent , Remove X charge counters from this artifact: Scry X.

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Showing Shadows over Innistrad#252

Price

0.25 $

Foil 2.36 $

13 printings

Daily estimate from Scryfall, not a shop quote.

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Brain in a Jar rulings

2016-04-08
When resolving the first ability of Brain in a Jar, the newly-placed charge counter will be counted when determining what spells you may cast. No player may take any action between you placing the counter and choosing which spell to cast.
2016-04-08
If Brain in a Jar leaves the battlefield before its first ability resolves, use the number of counters on it at the moment it left to determine what spell you may cast. That number won’t change because you can’t put a new counter on Brain in a Jar.
2016-04-08
If you cast a card “without paying its mana cost,” you can’t choose to cast it for any alternative costs, such as awaken costs. You can, however, pay additional costs, such as kicker costs. If the card has any mandatory additional costs, such as that of Lightning Axe, you must pay those to cast the card.
2016-04-08
If the card has in its mana cost, you must choose 0 as the value of X.

Brain in a Jar keyword rules

Scry Rule 701.18

To “scry N” means to look at the top N cards of your library, then put any number of them on the bottom of your library in any order and the rest on top of your library in any order.

If a player is instructed to scry 0, no scry event occurs. Abilities that trigger whenever a player scries won’t trigger.

If multiple players scry at once, each of those players looks at the top cards of their library at the same time. Those players decide in APNAP order (see rule ) where to put those cards, then those cards move at the same time.

An ability that triggers whenever a player scries triggers after the process described in rule is complete, even if some or all of those actions were impossible.