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1 week ago Slave of Bolas - (Gatherer) (Scryfall) (EDHREC)
{3}{U/R}{B} Sorcery Gain control of target creature. Untap that creature. It gains haste until end of turn. Sacrifice it at the beginning of the next end step.
Daemogoth Woe-Eater - (Gatherer) (Scryfall) (EDHREC)
{1}{B}{B/G}{G} Creature — Demon 7/6 At the beginning of your upkeep, sacrifice a creature. When you sacrifice Daemogoth Woe-Eater, each opponent discards a card, you draw a card, and you gain 2 life.
Colfenor, the Last Yew - (Gatherer) (Scryfall) (EDHREC)
{3}{W}{B}{G} Legendary Creature — Treefolk Shaman 3/7 Vigilance, reach Whenever Colfenor, the Last Yew or another creature you control dies, return up to one other target creature card with lesser toughness from your graveyard to your hand.
Title is informed speculation.
Observed behavior: Player A cast [[Slave of Bolas]] to gain control of Player B's [[Daemogoth Woe-Eater]]. When Player A sacrificed Daemogoth Woe-Eater to the delayed trigger of Slave of Bolas, Player A was forced to discard rather than Player B. Expected behavior is that Player B should be forced to discard, not Player A.
Also observed: Player A cast Slave of Bolas to gain control of Player B's [[Colfenor, the Last Yew]]. When Player A sacrificed Colfenor to the delayed trigger of Slave of Bolas, Player A did get to return a creature card from their graveyard as expected.
Honestly not sure where in the engine this would need to be fixed.