Rem Karolus, Stalwart Slayer
Flying, haste
If a spell would deal damage to you or another permanent you control, prevent that damage.
If a spell would deal damage to an opponent or a permanent an opponent controls, it deals that much damage plus 1 instead.
Illustrated by Andy Brase
This printing
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Some spells cause other objects to deal damage, such as spells that cause two creatures to fight. Rem Karolus, Stalwart Slayer's last two abilities don't apply to damage from such effects.
If another effect modifies how much damage a spell would deal to an opponent or a permanent they control, including preventing some of it, the player being dealt damage or the controller of the permanent being dealt damage chooses an order in which to apply those effects. If all of the damage is prevented, Rem's effect no longer applies.
Rem Karolus, Stalwart Slayer's last two abilities apply only to damage dealt by spells on the stack. A spell that becomes a permanent and then deals damage won't be affected.
If damage dealt by a source you control is being divided or assigned among multiple permanents an opponent controls or among an opponent and one or more permanents they control, divide the original amount before adding 1. For example, if you cast a spell that deals 4 damage divided among any number of targets and you choose to have it deal 2 damage to a creature and 2 damage to that creature's controller, that spell will deal 3 damage to each of them instead.
The additional 1 damage is dealt by the original source of damage. The additional damage isn't dealt by Rem Karolus.
