you would gain from reaping is stolen from your opponent Official Rulings
My opponent has Sir Marrows (AoA 223) in play. If I play Dimension Door (CoTA 108) and then reap with a creature, does Sir Marrows capture the Æmber from the creature reaping?
No, in this case the effect of gaining the Æmber from reaping is being replaced by stealing Æmber from your opponent. This means that you aren’t getting Æmber directly from the reap and your opponent’s Sir Marrows will not be able to capture it.
Source: Rulebook
My opponent has Sir Marrows (AoA 223) in play. If I play Dimension Door (CoTA 108) and then reap with a creature, does Sir Marrows capture the Æmber from the creature reaping?
No, in this case the effect of gaining the Æmber from reaping is being replaced by stealing Æmber from your opponent. This means that you aren’t getting Æmber directly from the reap and your opponent’s Sir Marrows will not be able to capture it.
Source: Rulebook
Commentary
Dimension Door creates a replacement effect that replaces the source of Æmber for reaping with a steal from the opponent. If Dimension Door is played when an opponent has no Æmber in their pool, the active player will gain no Æmber for reaping.
Source: Replacement Effects
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