The Necrobloom

If you control multiple lands with the same name, only one of those lands will count toward the seven or more required to create a Zombie. For example, if you control four lands named Forest, two named Plains, and one named Swamp, you control three lands with different names.

If multiple lands enter the battlefield under your control simultaneously, all of those lands are counted. For example, if you sacrifice seven lands while resolving Scapeshift and search your library for seven lands with different names, you'll create seven Zombie tokens.

If you're drawing multiple cards, each draw is performed one at a time. For example, if you're instructed to draw two cards and you replace the first draw with a dredge ability, another card with a dredge ability (including one that was put into your graveyard by the first dredge ability) may be used to replace the second draw.