In terms of content, M21 has had more entires to new planes than M20 by a fair margin (almost 25%), and M20 beat out M19 by a good stretch as well
You could just add Forests, Swamps, and Plains to your deck and call it a day, but that would probably result in you drawing Swamps when you need Forests and Plains when you need Swamps, so we need to look into other options
For example, there was a lot of hubbub when Saw in Half was spoiled
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Playing All-In Reanimator The most common play pattern for this deck will be to find a discard outlet (such as Bazaar of Bagdad, Recall, or Wheel of Fortune), and then use it to dump one or more large creatures in to the graveyard
I play these cards as filler, as support, when I have dodgy mana, when I have delirium and delve effects and generally quite a lot