I didnt think that was properly representative, so I tried to look past the obvious but theres just no looking past a bomb like Varina
The symbol itself shows which set the card belongs to, and its color indicates its rarity
If you want a historical piece, this is an alright starting point, but I would absolutely otherwise recommend any other method over it
It's literally in tutorials used to introduce new players to Arena for the first time, and there's no reason it can't exist in paper
You need minimum four swamps in play before this starts netting mana, but the mana advantage gets better and better with every land you play
If you hold up two mana, you can block with it and return it to play before your next turn starts, letting it singlehandedly chump block a creature forever