cards you can cast from graveyard mtg Conduit of Worlds Wrexial and casting Aftermath cards

The Warring Triad Congratulations, you now have a mana rock in the command zone, though it doesnt even fix your mana since you only need colorless anyway

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Other times, its just because theyre huge

However, they are widely accepted for "kitchen table" casual play, playtesting decks, and Cube drafts, provided they are clearly marked as proxies and not sold as authentic cards

You can also populate the tokens with cards like Nesting Dovehawk

There are lots of powerful synergies around these effects, and you can often get away with what looks like group hug before you pull the rug out because Magic players can be greedy