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To make the most out of March of Souls, don't look at it so much as a sweeper, but rather a form of mass creature-replacement

When combined with cards that trigger whenever you gain life, Soul Sisters cards can spiral into you having a ton of life, as well as enabling your win conditions

EDH has a large enough card pool that you should have plenty of decent cyclers to include, too

And the card this relates to

The main items are detailed down below, quoted from WotCs official article: Creatures without creature types got some creature types. Some artifact creature cards just said summon artifact and some legendary creature cards said summon legend. For example, the first printing of Rorix Bladewing was a Creature Dragon Legend, but this was changed to Legendary Creature Dragon. Creatures that lacked races got a race. Samite Healer was a cleric but is now a human cleric