pokemon cards obsidian flames charizard ex end display Charizard EX 228/197 Obsidian Flames

While not all do, this can be helpful for picking up cards for your collection or your deck in a pinch

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Not having to print cards for Commander players in every single set means that everything can be a little bit more surgical and precise

There are other even smaller cards that do things like this with extra conditions, like Edgewall Innkeeper

Theres also Edgar, Charmed Groom, which is very much worth the inclusion, yet puts many creatures out of range of triggering Welcoming Vampire as well

Unlike cards like Mana Vault or Jeweled Lotus, though, you can keep using these cards for mana on subsequent turns without investing any additional resources