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And that's a common situation - Ancient Tomb, Guildless Commons, or Temple of the False God can also tap for 2 mana

However, in actual play it can be rather confusing always having to look into the legend

Koskun Falls While you might think of this as something of a color-shifted Propaganda, Koskun Falls was actually printed first and was the first Ghostly Prison style effect

Items like Pawpsicle replace themselves early on while Iceblock softens targets for certain removal plays

Cards like Hashaton, Scarab's Fist weaponize discarding cards while reanimation engines like Zul Ashur, Lich Lord paired with other cards like Reanimate and Buried Alive keep the undead coming back for more