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If you somehow control Hollowmurk Siege and no choice was made for it (perhaps because another permanent on the battlefield became a copy of it), it has neither of the two abilities

The flexibility to put the Spark on any creature pushes the boundaries of Magic in an exciting way

This creates a repeatable engine where each two mana invested produces a 1/1 token while simultaneously boosting your board

All Black decks have access to Bojuka Bog and any deck can add Scavenger Grounds, and there are tons of efficient artifacts that hate graveyards like Soul-Guide Lantern

More importantly, everything else that triggers on the end step also goes again

Now thats a roaring value engine to say the least