Maro's Gone Nuts #81

Nov 12, 2019

An effect that increases something by a specific amount (such as the first ability of Jaya, Venerated Firemage) isn't doubling, even if the result is double the normal result.

Nov 12, 2019

An effect "doubles" if it instructs a player to double something, or if it replaces an event with "double that much," "twice as many," or similar.

Nov 12, 2019

Double strike isn't an effect, so it's not doubled.

Nov 12, 2019

If two Maro's Gone Nuts are on the battlefield, effects that double instead octuple. If three are on the battlefield, effects that double instead sexdecuple, and so on.