mtg search library for a card World Map - Artifact - Cards Whenever your commander enters or attacks Rules Text: Search your library

Cards like these are exceptionally rare, with the drop rate of these cards averaging out to being just one per three to four cases (though that number will vary from set to set)

With mana denial spells you are using them because you cant easily beat the things you will face if they have all the mana they need

Three different Final Fantasy cards are still great, but their impact has been most noticeable in one format: Commander

That shouldnt stop you considering them for your other decks, though especially when you have a cheap evasive Commander

It's a burning lava crater or rock of some sort

You take two piles of cards (probably halves of your deck in smaller deck formats) and push them together so the cards interweave